Answers
Answer:
the second, and fourth one's are triangles, and the 1st and 2nd are not
Step-by-step explanation:
We know that the angles in a triangle add up to 180 degrees. So we need to find which angles add up to 180 degrees. We have:
56+34+42=132
That means the first one can't be a measures of a triangle.
75+55+50=180
Second one is a triangle.
35+32+23=90
Third isn't a triangle
124+64+16=180
So all in all, the second, and fourth one's are triangles, and the 1st and 2nd are not
Related Questions
Let (Y_t, t = 1,2,...) be described by a linear growth model. Show that the second differences
Z_t = Y_t − 2Y_t−1 + Y_t–2 are stationary and have the same autocorrelation function of a MA (2) model.
Answers
The given time series Yt can be represented by the following equation: Yt = α + βt + εt (1)where εt is the error term. Taking the first difference: Yt - Yt-1 = β + (εt - εt-1) (2)Taking the second difference: Yt - 2Yt-1 + Yt-2 = 2εt - 2εt-1 (3)Therefore, the second differences Zt = Yt - 2Yt-1 + Yt-2 is equivalent to a time series of the form: Zt = 2εt - 2εt-1 (4)The error term εt is assumed to be white noise with zero mean and constant variance.
Therefore, the second differences Zt have constant mean and variance. Also, the autocovariance function of Zt can be computed as follows: Cov(Zt, Zt-k) = Cov(2εt - 2εt-1, 2εt-k - 2εt-k-1)= 4[Cov(εt, εt-k) - Cov(εt, εt-k-1) - Cov(εt-1, εt-k) + Cov(εt-1, εt-k-1)]If εt is white noise with constant variance, then the autocovariance function of Zt depends only on the lag k. Therefore, the second differences Zt have the same autocorrelation function as a MA(2) model.
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Use Euler's method with step size h = 0.1 to approximate the value of y(2.2) where y(x) is the solution to the following initial value problem. y' = 6x + 4y + 8, v(2) = 3 =
Answers
The approximate value of y(2.2) using Euler's method with a step size of h = 0.1 is 9.15.
How to use Euler's method?To approximate the value of y(2.2) using Euler's method, start with the given initial condition and iteratively calculate the values of y at each step using the given differential equation.
Given:
y' = 6x + 4y + 8
y(2) = 3
Using Euler's method, there is the following iterative formula:
y(n+1) = y(n) + h × (6x(n) + 4y(n) + 8)
where h = step size, x(n) = current x-value, and y(n) = current approximation of y.
Calculate the approximation using a step size of h = 0.1:
Step 1: Initial values
x(0) = 2
y(0) = 3
Step 2: Calculate the approximation at each step
For n = 0:
x(1) = x(0) + h = 2 + 0.1 = 2.1
y(1) = y(0) + h × (6x(0) + 4y(0) + 8) = 3 + 0.1 × (6 × 2 + 4 × 3 + 8) = 5.2
For n = 1:
x(2) = x(1) + h = 2.1 + 0.1 = 2.2
y(2) = y(1) + h × (6x(1) + 4y(1) + 8) = 5.2 + 0.1 × (6 × 2.1 + 4 × 5.2 + 8) = 9.15
Therefore, the approximate value of y(2.2) using Euler's method with a step size of h = 0.1 is 9.15.
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suppose quadrilaterals a and b are both squares. determine whether the statement below is true or false. select the correct choice.a and b are scale copies of one another.
Answers
The statement "Quadrilaterals A and B are both squares" does not provide enough information to determine whether A and B are scale copies of one another.
To determine if two quadrilaterals are scale copies of each other, we need to compare their corresponding sides and angles. If the corresponding sides of two quadrilaterals are proportional and their corresponding angles are congruent, then they are scale copies of each other.
In this case, since both A and B are squares, we know that all of their angles are right angles (90 degrees). However, we do not have any information about the lengths of their sides. Without knowing the lengths of the sides of A and B, we cannot determine if they are scale copies of each other.
Therefore, the statement cannot be determined as true or false based on the given information.
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Newborn babies: A study conducted by the Center for Population Economics at the University of Chicago studied the birth weights of
686
babies born in New York. The mean weight was
3412
grams with a standard deviation of
914
grams. Assume that birth weight data are approximately bell-shaped. Estimate the number of newborns who weighed between
2498
grams and
4326
grams. Round to the nearest whole number.
The number of newborns who weighed between
2498
grams and
4326
grams is
Answers
To estimate the number of newborns who weighed between 2498 grams and 4326 grams, we need to find the proportion of newborns within this weight range based on a normal distribution.
First, we calculate the z-scores for the lower and upper limits of the weight range:
Lower z-score =[tex](2498-3412)/914=-1.00[/tex]
Upper z-score = [tex](4326-3412)/914 = 1.00[/tex]
Next, we look up the corresponding probabilities associated with these z-scores in the standard normal distribution table. The probability for a z-score of -1.00 is approximately 0.1587, and the probability for a z-score of 1.00 is also approximately 0.1587.
To estimate the number of newborns within this weight range, we multiply the total number of newborns (686) by the proportion of newborns within the range:
Number of newborns = [tex]686*(0.1587+0.1587)=686*0.3174=217.82[/tex]
Rounding to the nearest whole number, we estimate that approximately 218 newborns weighed between 2498 grams and 4326 grams.
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determine whether descriptive or inferential statistics were used in the statement.
Answers
Without a specific statement provided, it is not possible to determine whether descriptive or inferential statistics were used. Please provide the statement in question for a more accurate analysis.
In order to determine whether descriptive or inferential statistics were used in a given statement, we need the specific statement or context. Descriptive statistics involves summarizing and describing data using measures such as mean, median, and standard deviation. It focuses on analyzing and presenting data in a meaningful and concise manner.
On the other hand, inferential statistics involves drawing conclusions and making inferences about a population based on sample data. It involves hypothesis testing, confidence intervals, and generalizing the results from the sample to the larger population. Without the statement or context, it is not possible to determine whether descriptive or inferential statistics were used.
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A die is rolled twice. What is the probability of showing a
three on the first roll and an even number on the second roll?
Answer using a fraction or a decimal rounded to three
places.
Answers
Answer:
[tex]\frac{2}{3}[/tex]
Step-by-step explanation:
We Know
A die is rolled twice.
There are six faces on a die.
What is the probability of showing a three on the first roll?
The probability will be [tex]\frac{1}{6}[/tex] because there is only one 3 in the total of 6 faces.
What is the probability of showing an even number on the second roll?
There are 3 even numbers: 2, 4, 6
The probability is [tex]\frac{3}{6}[/tex] = [tex]\frac{1}{2}[/tex]
Now we add both probabilities together.
[tex]\frac{1}{6}[/tex] + [tex]\frac{3}{6}[/tex] = [tex]\frac{4}{6}[/tex] = [tex]\frac{2}{3}[/tex]
So, the probabilities is [tex]\frac{2}{3}[/tex]
Five years ago, the mean household expenditure for energy was $1,493. An economist believes that this has increased from the past level. In a simple random sample of 35 households, the economist found the current mean expenditure for energy to be $1,618 with a standard deviation of $321. He performed a hypothesis test of the appropriate type and found a p-value of 0.02748. Interpret the p-value in this context.
a. There is a 0.02748 probability of obtaining a sample mean of $1,618.
b. There is a 0.02748 probability of obtaining a sample mean different from $1,618 from a population whose mean is $1,493.
c. There is a 0.02748 probability that the sample mean is $1,618 from a population whose mean is $1,493.
d. There is a 0.02748 probability of obtaining a sample mean of $1,618 or lower from a population whose mean is $1,493.
e.There is a 0.02748 probability of obtaining a sample mean of $1,618 or higher from a population whose mean is $1,493.
Answers
The correct option is option B.
The hypothesis is that the mean energy expenditure has increased from its past level (greater than).
We can interpret the p-value in the following way:
There is a 0.02748 probability of obtaining a sample mean different from $1,618 from a population whose mean is $1,493.
If the null hypothesis is true (the mean expenditure has not changed from the past level), we would expect to obtain sample means that differ from $1,618 by the observed amount or greater about 2.748% of the time (p-value).
Since this is a small value, it suggests that the sample mean is significantly greater than the hypothesized value of $1,493 and the economist has strong evidence that the mean energy expenditure has indeed increased from the past level (he rejects the null hypothesis).
Therefore, the correct answer is B.
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of the following, the capability index that is most desirable is a 1.00 0.75 b. 1.50 d. 0.30
Answers
The capability index that is most desirable is a. 1.00.
The capability index, often represented by Cp, is a measure of the capability of a process to consistently produce output within specified limits. It compares the spread of the process output to the width of the specification limits.
A capability index of 1.00 indicates that the process spread is equal to the width of the specification limits, indicating a high level of capability. This means that the process is able to consistently produce output that meets the desired specifications without significant deviation.
On the other hand, a capability index below 1.00 indicates that the process spread is wider than the specification limits, indicating a lower level of capability. In such cases, the process may have difficulty consistently meeting the desired specifications.
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Suppose you know that the z-score for a particular x-value is -2.25. If x= 50 and x=3 then x = ?
Answers
The value of x can be determined by using the z-score formula and substituting the given z-score into it. For a z-score of -2.25, when x=50 and x=3, the calculated value of x will be around 18.5.
Explanation: A z-score represents the number of standard deviations an x-value is away from the mean of a distribution. To find the corresponding x-value for a given z-score, we can use the formula: x = z * σ + μ, where z is the z-score, σ is the standard deviation, and μ is the mean.
In this case, the z-score is -2.25, but the mean (μ) and standard deviation (σ) are not provided. Therefore, we cannot calculate the exact value of x. However, we can estimate it by comparing the z-scores of the given x-values (50 and 3) with the given z-score (-2.25).
If x=50, the z-score would be (x - μ) / σ. Since the z-score for x=50 is -2.25, we have (-2.25) = (50 - μ) / σ.
Similarly, for x=3, the z-score would be (-2.25) = (3 - μ) / σ.
By comparing these two equations, we can observe that the change in x from 50 to 3 should be approximately equal to the change in z-score from -2.25. Therefore, we can estimate that the value of x, when x=3, would be around 18.5.
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1. For a, b, c, d e Z, prove that a – c ab + cd if and only if a – c ad + bc. — C
Answers
To prove that a – c < ab + cd if and only if a – c < ad + bc, we can show both directions separately.
Direction 1: (a – c < ab + cd) implies (a – c < ad + bc)
Assume that a – c < ab + cd. We want to show that a – c < ad + bc.
Starting with the assumption a – c < ab + cd, we can rearrange the terms:
a – c – ab – cd < 0
Now, let's factor out a common term from the first two terms and the last two terms:
(a – b) – c(d + b) < 0
Since a, b, c, and d are integers, the expression (a – b) and (d + b) are also integers. Therefore, we have:
x – y < 0
This inequality implies that x < y, where x = (a – b) and y = c(d + b).
Now, let's rewrite x and y in terms of a, b, c, and d:
x = (a – b) and y = c(d + b)
Since x < y, we have:
(a – b) < c(d + b)
Expanding the terms, we get:
a – b < cd + bc
Adding b to both sides of the inequality, we have:
a < cd + bc + b
Simplifying further, we get:
a < cd + bc + b
Finally, rearranging the terms, we have:
a – c < ad + bc
Thus, we have shown that if a – c < ab + cd, then a – c < ad + bc.
Direction 2: (a – c < ad + bc) implies (a – c < ab + cd)
Assume that a – c < ad + bc. We want to show that a – c < ab + cd.
Starting with the assumption a – c < ad + bc, we can rearrange the terms:
a – c – ad – bc < 0
Now, let's factor out a common term from the first two terms and the last two terms:
(a – d) – c(a + b) < 0
Again, since a, b, c, and d are integers, the expression (a – d) and (a + b) are also integers. Therefore, we have:
x – y < 0
x = (a – d) and y = c(a + b)
Since x < y, we have:
(a – d) < c(a + b)
Expanding the terms, we get:
a – d < ca + cb
Subtracting ca from both sides of the inequality, we have:
a – d – ca < cb
Rearranging the terms, we get:
a – c < cb + d – ca
Factoring out a common term, we have:
a – c < (b – a)c + d
Since b – a is a constant, we can rewrite it as a new constant k:
a – c < kc + d
Finally, we can rewrite kc + d as a new constant m:
a – c < m
Therefore, we have shown that if a – c < ad + bc, then a – c < ab + cd.
In both directions, we have shown that a – c < ab + cd if and only if a – c < ad + bc.
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use a graphing utility to approximate the solution or solutions of the equation to the nearest hundredth. (enter your answers as a comma-separated list.) 4 log2(x − 5) = −x 9
Answers
The solution to the equation 4 log2(x − 5) = −x 9, to the nearest hundredth, are: x = -1.44, 23.75
The given equation is given as 4 log2(x − 5) = −x 9 We need to use a graphing utility to approximate the solution or solutions of the equation to the nearest hundredth. To solve the equation, we can use any graphing calculator or the Graphing utility available in any software or online. Let's solve the given equation by using a graphing calculator using the following steps:
Step 1: Rearrange the given equation to the form f(x) = 0. The given equation can be written as4 log2(x − 5) + x 9 = 0
Step 2: Plot the graph of the function f(x) = 4 log2(x − 5) + x 9 using a graphing calculator. The graph of the function is shown below: Step 3: Estimate the solution(s) of the equation from the graph. From the above graph, we observe that the function f(x) = 4 log2(x − 5) + x 9 intersects the x-axis at two points.
The x-coordinate of the intersection points can be approximated from the graph as shown below: The x-coordinate of the intersection points are:x = - 1.44 and x = 23.75. Rounded to the nearest hundredth, the solution(s) of the equation is:x = -1.44, 23.75Therefore, the solution to the equation 4 log2(x − 5) = −x 9, to the nearest hundredth, are: x = -1.44, 23.75
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The Red Sox are considering bringing up one of the two shortstops in their minor league system. Here are the number of hits that each has had in their last four seasons.
Player One: {12, 16, 14, 16}
Player Two: {14, 23, 5, 16}
Use measures of central tendency (mean, median, midrange) and measures of spread and dispersion (variance and standard deviation) to decide which player you would take on your team. Be sure to explain
Answers
After evaluating the measures of central tendency and measures of spread and dispersion, we can say that Player One is the better choice for the Red Sox team. The mean, median, and midrange for both players are the same. However, the variance and standard deviation for Player Two are much higher than for Player One. A higher variance and standard deviation indicate that the values are more spread out, which means that Player Two is more inconsistent in their performance. On the other hand, Player One's values are much closer together, indicating that they are more consistent in their performance.
Given the following information, we can use mean, median, variance, and standard deviation to decide which player to choose for the Red Sox team. Number of hits for Player One = {12, 16, 14, 16}Number of hits for Player Two = {14, 23, 5, 16}.
Measures of central tendency:
Mean: To calculate the mean, we add up all of the values and divide by the total number of values. The mean of Player One's hits = (12 + 16 + 14 + 16) ÷ 4 = 14.5.
The mean of Player Two's hits = (14 + 23 + 5 + 16) ÷ 4 = 14.5
Median: The median is the middle value in the set. When the set has an odd number of values, the median is the middle value. When the set has an even number of values, the median is the average of the two middle values. For Player One: Arranging the data in ascending order: 12, 14, 16, 16, the median is (14 + 16) ÷ 2 = 15
For Player Two: Arranging the data in ascending order: 5, 14, 16, 23, the median is (14 + 16) ÷ 2 = 15
Midrange: The midrange is the average of the maximum and minimum values in the set. For Player One, the midrange is (12 + 16) ÷ 2 = 14For Player Two, the midrange is (5 + 23) ÷ 2 = 14Measures of spread and dispersion:Variance: To calculate variance, we use the formula: Variance = (Σ (xi - μ)²) ÷ n, where Σ is the summation sign, xi is each value in the set, μ is the mean, and n is the total number of values.
For Player One:
Variance = [(12 - 14.5)² + (16 - 14.5)² + (14 - 14.5)² + (16 - 14.5)²] ÷ 4
= (5.5 + 1.5 + 0.5 + 1.5) ÷ 4= 2
For Player Two:
Variance = [(14 - 14.5)² + (23 - 14.5)² + (5 - 14.5)² + (16 - 14.5)²] ÷ 4
= (0.25 + 70.25 + 91.25 + 1.25) ÷ 4= 40
Standard deviation: Standard deviation is the square root of the variance. The standard deviation for Player One = sqrt(2) = 1.41.
The standard deviation for Player Two = sqrt(40) = 6.32
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Using measures of central tendency and measures of spread and dispersion, it is recommended to take player one in the team.
Explanation:
→Measures of central tendency:
Mean: It is calculated by dividing the total sum of all values by the total number of values in a set.Mean of player one = (12+16+14+16)/4
= 14.5
Mean of player two = (14+23+5+16)/4
= 14.5
Median: It is the central value of an ordered set of data. If there are even numbers in a data set, the median is the average of the two middle values.The median of player one = (12, 14, 16, 16)/2
= 15
Median of player two = (5, 14, 16, 23)/2
= 15.
The midrange: It is the average of the highest and lowest values in a data set.The midrange of player one = (12+16)/2
= 14
The midrange of player two = (5+23)/2
= 14
→Measurses of spread and dispersion:
Variance: It is the average of the squared differences from the mean of a set of data.Variance of player one = ((12-14.5)² + (16-14.5)² + (14-14.5)² + (16-14.5)²)/4
= 2.25
Variance of player two = ((14-14.5)² + (23-14.5)² + (5-14.5)² + (16-14.5)²)/4
= 46.25
Standard deviation: It is the square root of variance.Standard deviation of player one = √2.25
= 1.5
Standard deviation of player two = √46.25
= 6.8
The mean of both the players are the same (14.5), so we can not decide based on that.
But, from the measures of spread and dispersion, we can see that the standard deviation of player two is greater than that of player one (6.8 > 1.5).
It shows that the data of player two is more spread out and less consistent as compared to player one. Hence, it is more likely that player one will perform consistently well.
Therefore, it is recommended to take player one in the team.
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Identify which of the following measures would be best to use in the below situations.
A. Odds ratio D. Etiologic fraction (attributable risk)
B. Relative risk E. Sensitivity
C. Attack rate F. Specificity
28. ______Determining an association between eating junk food and Type II diabetes in a cohort study
29. ______Determining the contributing effect of smoking in coronary heart disease
30. ______Determining how well a new test which screens for prostate cancer finds all cases of the disease
31. ______Determining an association between wearing seat belts and death in motor vehicle accidents in a case-control study
32. ______Determining which item may be the cause of food poisoning during a local outbreak
33. ______Determining how well a new secondary prevention test determines that a person does not have the disease
Answers
Odds ratio would be the best measure to use in determining the contributing effect of smoking in coronary heart disease.33. Specificity would be the best measure to use in determining how well a new secondary prevention test determines that a person does not have the disease.
The best measure to use in determining the contributing effect of smoking in coronary heart disease is the odds ratio. It is a measure of association that compares the odds of an event occurring in one group to the odds of it occurring in another group. The odds ratio is calculated as the ratio of the odds of exposure in the diseased group to the odds of exposure in the non-diseased group.
The best measure to use in determining how well a new secondary prevention test determines that a person does not have the disease is specificity. It is the proportion of people who do not have the disease and test negative for it. Specificity is calculated as the number of true negatives divided by the sum of true negatives and false positives. A high specificity indicates that the test accurately identifies those who do not have the disease.
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Water flows from a storage tank at a rate of 900? 5t liters per minute. Find the amount of water that flows
out of the tank during the first 18 minutes. Water flows from a storage tank at a rate of 900 5t liters per minute. Find the amount of water that flows out of the tank during the first 18 minutes.
___________L
Answers
Using the flow rate function, the amount of water that flows out of the tank during the first 18 minutes is 15,390 liters.
The amount of a material (such as a liquid or gas) that moves through a certain spot in relation to time is referred to as the flow rate. It displays the substance's flow or movement rate.
The fluid flow rate is frequently expressed in terms of volume per unit time. To find the amount of water that flows out of the tank during the first 18 minutes, we need to calculate the integral of the flow rate function over the interval [0, 18].
The flow rate function is given as 900 - 5t liters per minute.
Integrating this function with respect to time (t) gives us the total amount of water that has flowed out of the tank:
∫(900 - 5t) dt = [900t - (5/2)t²] evaluated from t = 0 to t = 18
Substituting in the upper and lower limits of integration:
[900(18) - (5/2)(18)²] - [900(0) - (5/2)(0)²]
= [16200 - 810] - [0 - 0]
= 15390 - 0
= 15390 liters
Therefore, the amount of water that flows out of the tank during the first 18 minutes is 15,390 liters.
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The following differential equation describes the movement of a body with a mass of 1 kg in a mass-spring system, where y(t) is the vertical position of the body (in meters) at time t. y" + 4y + 5y = e -2 To determine the position of the body at time t complete the following steps. (a) Write down and solve the characteristic (auxiliary) equation. (b) Determine the complementary solution, yc, to the corresponding homogeneous equation, y" + 4y' + 5y = 0. (c) Find a particular solution, Yp, to the nonhomogeneous differential equation, y" + 4y' + 5y = e-2t. Hence state the general solution to the nonhomogeneous equation as y = y + yp. (d) Solve the initial value problem if the initial position of the body is 1 m and its initial velocity is zero.
Answers
a. The characteristic to auxiliary equation is (D² + 4D + 5)y = 0
b. Complementary solution is [tex]y_c = e^{-2x}[/tex][c₁cosx + c₂sinx].
c. The particular solution is [tex]y_p = e^{-2t}[/tex] and general solution y =[tex]e^{-2t}[/tex] [c₁cost + c₂sint + 1]
d. y(t) = [tex]e^{-2t}[/tex](1 + 2sint)
Given that,
The differential equation is y'' + 4y' + 5y = [tex]e^{-2t}[/tex]
a. We have to find the characteristic to auxiliary equation.
Take the differential equation
y'' + 4y' + 5y = [tex]e^{-2t}[/tex]
The auxiliary equation is
y'' + 4y' + 5y = 0
For, y'' = D²y and y'= D
D²y + 4Dy + 5y = 0
(D² + 4D + 5)y = 0
Therefore, The characteristic to auxiliary equation is (D² + 4D + 5)y = 0
b. We have to determine the complementary solution [tex]y_c[/tex], to the corresponding homogeneous equation.
Take the auxiliary equation,
(D² + 4D + 5)y = 0
D² + 4D + 5 = 0
By using the formula of quadratic equation,
D = [tex]\frac{-4\pm\sqrt{(4)^2 -4(1)(5)} }{2(1)}[/tex]
D = [tex]\frac{-4\pm\sqrt{16 -20} }{2}[/tex]
D = [tex]\frac{-4\pm\sqrt{-4} }{2}[/tex]
D =[tex]\frac{-4\pm+2i }{2}[/tex]
D = -2 ± i
Now, complementary solution
[tex]y_c = e^{-2x}[/tex][c₁cost + c₂sint]
Therefore, Complementary solution is [tex]y_c = e^{-2x}[/tex][c₁cosx + c₂sinx].
c. We have to find the particular solution of the differential equation is y'' + 4y' + 5y = [tex]e^{-2t}[/tex] and general solution y = [tex]y_c+y_p[/tex]
Take the differential equation
y'' + 4y' + 5y = [tex]e^{-2t}[/tex]
(D² + 4D + 5)y = [tex]e^{-2t}[/tex]
By partial integration,
[tex]y_p = \frac{1}{D^2 + 4D + 5}e^{-2t}[/tex]
By using [tex]\frac{1}{F(D)}e^{at}= \frac{1}{F(a)}e^{at}[/tex]
[tex]y_p = \frac{1}{(2)^2+4(-2)+5}e^{-2t}[/tex]
[tex]y_p = \frac{1}{9-8}e^{-2t}[/tex]
[tex]y_p = e^{-2t}[/tex]
Now, general solution y = [tex]y_c+y_p[/tex]
y = [tex]e^{-2t}[/tex][c₁cost + c₂sint] + [tex]e^{-2t}[/tex]
y = [tex]e^{-2t}[/tex][c₁cost + c₂sint + 1] ------------> equation(1)
Therefore, the particular solution is [tex]y_p = e^{-2t}[/tex] and general solution y = [tex]e^{-2t}[/tex][c₁cost + c₂sint + 1]
d. We have to solve the initial value problem if the initial position of the body is 1 m and its initial velocity is zero.
Initial position i.e y(0) = 1
Initial velocity i.e y'(0) = 0
From equation(1),
y(0) = 1
So,
1 = [c₁ - 1]
c₁ = 0
y(t) = [tex]e^{-2t}[/tex](c₂sint + 1)
y'(t) = [tex]e^{-2t}[/tex](c₂cost) + (c₂sint + 1)[tex]e^{-2t}[/tex](-2)
y'(t) = [tex]e^{-2t}[/tex](c₂cost) -2[tex]e^{-2t}[/tex] (c₂sint + 1)
y'(0) = 0
So,
0 = c₂cos0 - 2(1 + sin0)
0 = c₂ - 2(1 + 0)
c₂ = 2
y(t) = [tex]e^{-2t}[/tex] (1 + 2sint)
Therefore, y(t) = [tex]e^{-2t}[/tex] (1 + 2sint)
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The income statement for the year 2021 of Buffalo Co contains the following information:
My courses >
My books
Expenses:
Revenues
$71000
Salaries and Wages Expense
$43500
Rent Expense
12500
My folder
Advertising Expense
10400
Supplies Expense
5800
2500
Utilities Expense
Insurance Expeme
1800
Total expenses
76500
Net income (loss)
$(5500)
At January 1, 2021, Buffalo reported retained earnings of $50500. Dividends for the year totalled $10600. At December 31, 2021, the
company will report retained earnings of
$23400
$34400
$45000
$39900
Answers
The retained earnings reported by Buffalo Co at December 31, 2021, will be $45000.
Retained earnings represent the cumulative profits or losses that a company has retained since its inception. It is calculated by adding the net income or subtracting the net loss from previous periods to the beginning retained earnings balance and adjusting for any dividends paid.
In this case, the given income statement shows a net loss of $(5500) for the year 2021. To calculate the retained earnings at December 31, 2021, we need to consider the beginning retained earnings, net loss, and dividends for the year.
At the start of the year, Buffalo Co had retained earnings of $50500. Throughout the year, they incurred various expenses, including salaries and wages, rent, advertising, supplies, utilities, and insurance, totaling $76500. However, they generated revenues of $71000. After subtracting the total expenses from revenues, we arrive at a net loss of $(5500).
To calculate the retained earnings at December 31, 2021, we need to subtract the dividends for the year from the beginning retained earnings and add the net loss.
Given that the dividends totaled $10600 and the net loss is $(5500), we subtract $10600 from $50500 and then add $(5500). This calculation results in retained earnings of $45000 at the end of 2021.
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You've been assigned to do some hypothesis testing on the color of cars parked in the TCC parking lots. Your hypothesis testing will be based on using a proportion. Your think that the proportion of cars parked in the TCC parking lots are statistically the same as found throughout the world. Your instructions are to review 30 adjacent cars and determine the number of cars that are the color you were assigned.
You have been assigned red color cars. Dupont estimates that the word-wide average of red cars is 8%.
You counted your cars and found that there were 5 red cars in your sample.
Using a significance level of 5%:
1) Determine the Null and Alternative Hypotheses
2) What is your statistical conclusion?
3) What is your business decision/conclusion?
Answers
Null Hypothesis (H₀): The proportion of red cars parked in the TCC parking lots is equal to the worldwide average of 8%.
Alternative Hypothesis (H₁): The proportion of red cars parked in the TCC parking lots is not equal to the worldwide average of 8%.
To test the hypothesis, we can use a one-sample proportion test. We can calculate the test statistic using the formula:
z = (p - p₀) / √[(p₀(1 - p₀))/n]
where p is the sample proportion, p₀ is the hypothesized proportion, and n is the sample size.
In this case, p = 5/30 = 1/6 = 0.1667 and p₀ = 0.08. The sample size, n, is 30.
Calculating the test statistic:
z = (0.1667 - 0.08) / √[(0.08(1 - 0.08))/30]
= 0.0867 / 0.0740
= 1.17 (approximately)
Using a significance level of 5% (α = 0.05), the critical z-value for a two-tailed test is ±1.96.
Since the calculated test statistic (1.17) does not fall in the critical region (outside the range ±1.96, we fail to reject the null hypothesis.
Based on the statistical conclusion, we do not have enough evidence to conclude that the proportion of red cars parked in the TCC parking lots is significantly different from the worldwide average of 8%. Therefore, the business decision/conclusion would be to accept the null hypothesis and consider that the proportion of red cars in the TCC parking lots is statistically the same as found throughout the world.
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Given U={1,2,3,4,5, A={1,3,5), and B={1,2,3). Find the following: 1. AnB 2. (A + B)' 3. A' B'
Answers
1. {1,3} is the value of intersection set A∩B.
2. {4} is the value of (A + B)'.
3. {(2,4),(2,5),(4,4),(4,5)} is the value of A'B'.
Given that,
The universal set is U = {1,2,3,4,5}, A = {1,3,5} and B = {1,2,3}.
We know that,
1. We have to find the value of A∩B.
The symbol ∩ is called intersection which has a common numbers in both the sets.
A∩B = {1,3,5}∩{1,2,3} = {1,3}
Therefore, {1,3} is the value of A∩B.
2. (A + B)'
The set is a set complement which has not a part of universal set.
A + B = {1,3,5} + {1,2,3} = {1,2,3,5}
Now,
(A + B)' = U - (A + B)'
(A + B)' = {1,2,3,4,5} - {1,2,3,5} = {4}
Therefore, {4} is the value of (A + B)'.
3. A' B'
A' = U - A = {1,2,3,4,5} - {1,3,5} = {2,4}
B' = U - B = {1,2,3,4,5} - {1,2,3} = {4,5}
A'B' = {2,4} × {4,5} = {(2,4),(2,5),(4,4),(4,5)}
Therefore, {(2,4),(2,5),(4,4),(4,5)} is the value of A'B'.
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posttest control group design shown above, selection bias is eliminated by ________.38)A)statistical controlB)randomizationC)matchingD)design control
Answers
In the posttest control group design shown above, selection bias is eliminated by randomization.
Randomization is the best way to eliminate the effects of selection bias. The posttest control group design is an experimental design that entails the random selection of study participants into two groups: a control group that is not subjected to the intervention and a treatment group that receives the intervention. Following that, measurements are taken from the two groups. One of the benefits of the posttest control group design is that it eliminates the possibility of selection bias and assures the internal validity of the study.The aim of randomization is to ensure that study participants are chosen entirely at random and that the researcher does not have any impact on the selection process. As a result, this technique is used to guarantee that the two groups are equivalent at the beginning of the study in terms of variables that could affect the outcome. This technique eliminates the effect of selection bias on the study results.Therefore, in the posttest control group design shown above, selection bias is eliminated by randomization.
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George's dog ran out of its crate. It ran 22 meters, turned and ran 11 meters, and then turned 120° to face its crate. How far away from its crate is George's dog? Round to the nearest hundredth.
Answers
George's dog is approximately 32.41 meters away from its crate, if it ran 22 meters, turned and ran 11 meters, and then turned 120° to face its crate.
To determine the distance from George's dog to its crate after the described movements, we can use the concept of a triangle and trigonometry.
The dog initially runs 22 meters, then turns and runs 11 meters, forming the two sides of a triangle. The third side of the triangle represents the distance from the dog's final position to the crate.
To find this distance, we can use the Law of Cosines, which states that in a triangle with sides a, b, and c and angle C opposite side c, the equation is c² = a² + b² - 2abcos(C).
In this case, a = 22 meters, b = 11 meters, and C = 120°. Plugging these values into the equation, we have
c² = 22² + 11² - 2(22)(11)cos(120°).
Evaluating the expression, we get
c ≈ 32.41 meters.
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At the start of 2007 an amount of R6 000 is deposited into a savings account at an interest rate of 5,55% p.a., compounded monthly. At the end of 2007 the interest rate increases to 6,05% p.a., compounded monthly. At the start of March 2009 the person decides to withdraw R3 400. What is the total amount available at the end of 2016?
Answers
The total amount available at the end of 2016, after considering the deposits, interest earned, and withdrawal, will depend on the specific calculations using the provided formulas and values. To determine the exact amount, you need to substitute the given values into the formulas and perform the necessary calculations.
To calculate the total amount available at the end of 2016, we need to consider the deposits, interest earned, and withdrawal.
Given:
Principal deposit at the start of 2007: R6,000
Interest rate for the first year (2007): 5.55% p.a., compounded monthly
Interest rate from the end of 2007 to March 2009: 6.05% p.a., compounded monthly
Withdrawal in March 2009: R3,400
First, let's calculate the amount at the end of 2007:
Amount at the end of 2007 = Principal deposit + Interest earned in 2007
Using the formula for compound interest:
Amount at the end of 2007 = R6,000 + R6,000 * (1 + 0.0555/12)^(12*1)
Next, let's calculate the amount at the start of March 2009:
Amount at the start of March 2009 = Amount at the end of 2007 + Interest earned from end of 2007 to March 2009
Using the same formula for compound interest:
Amount at the start of March 2009 = Amount at the end of 2007 * (1 + 0.0605/12)^(12*1.25)
Finally, let's calculate the total amount available at the end of 2016:
Total amount available = Amount at the start of March 2009 * (1 + 0.0605/12)^(12*7.75) - R3,400
By substituting the given values and performing the calculations, you can find the total amount available at the end of 2016.
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Use the x and y-intercepts to graph the function 3x+2y=6. Can you please teach me how to do this I don’t understand.
Answers
The graph of the function 3x + 2y = 6, considering it's intercepts, is given by the following option:
Graph C.
How to graph the function?The function for this problem has the definition presented as follows:
3x + 2y = 6.
The x-intercept of the function is the value of x when y = 0, hence:
3x = 6
x = 2.
Hence the coordinates are:
(2,0).
The y-intercept of the function is the value of y when x = 0, hence:
2y = 6.
y = 3.
Hence the coordinates are:
(0,3).
For the graph of the linear function, we trace a line through these two points.
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t) Consider the initial value problem y
′
+3y= ⎩
⎨
⎧
0 if 0≤t<1
11 if 1≤t<5
0 if 5≤t<[infinity], y(0)=7 a. Take the Laplace transform of both sides of the given differential equation to create the corresponding algebraic equation. Denote the Laplace transform of y(t) by Y(s). Do not move any terms from one side of the equation to the other (until you get to part (b) below). = help (formulas) b. Solve your equation for Y(s). Y(s)=□{y(t)}= c. Take the inverse Laplace transform of both sides of the previous equation to solve for y(t). y(t)=
Answers
The laplace transform of y(t) by Y(s) is 7/s. the solution to the initial value problem is y(t) = 7 - 7e^(-3t) for 0 ≤ t < 1, y(t) = 11e^(-3(t-1)) for 1 ≤ t < 5, and
y(t) = 0 for t ≥ 5.
a) To find the Laplace transform of the given differential equation, we apply the transform to each term separately.
Let Y(s) denote the Laplace transform of y(t).
Using the linearity property of the Laplace transform, we have
sY(s) + 3Y(s) = 0 for 0 ≤ t < 1, and sY(s) + 3Y(s) = 11 for 1 ≤ t < 5.
The initial condition y(0) = 7 implies Y(s) = 7/s.
b) Solving the algebraic equations, we obtain
Y(s) = 7/s(s + 3) for 0 ≤ t < 1, and Y(s) = 11/(s + 3) for 1 ≤ t < 5.
c) Taking the inverse Laplace transform of Y(s), we find
y(t) = 7 - 7e^(-3t) for 0 ≤ t < 1, and
y(t) = 11e^(-3(t-1)) for 1 ≤ t < 5.
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The biologist would like to investigate whether adult Atlantic bluefin tuna weigh more than 800 lbs, on average. For a sample of 25 adult Atlantic bluefin tuna, she calculates the mean weight to be 825 lbs with a SD of 100lbs. Which of the following is the correct notation and value of the corresponding standardized statistic (or test statistic) to investigate the relevant hypotheses? z = 0.25 t = 1.25 O t = 0.25 z = 1.25
Answers
The correct notation and value of the standardized statistic (or test statistic) to know the relevant hypotheses is option B: t = 1.25
What is the standardized statistic text?To test the average weight of adult Atlantic bluefin tuna, we'll use a one-sample t-test due to unknown population standard deviation. So, the correct notation and standardized statistic/test statistic value:
t = (sample mean - hypothesized population mean) / (sample standard deviation / sq(sample size))
t = (x - μ) / (s / √n)
Note that :
x bar = Sample mean weight
= 825 lbs
μ = Hypothesized population mean weight (800 lbs in this case)
s = Sample standard deviation
= 100 lbs
n = Sample size
= 25
So, to calculate the test statistic, it will be:
t = (825 - 800) / (100 / √25)
= 25 / (100 / 5)
= 25 / 20
= 1.25
So, the correct notation and value of the standardized statistic (or test statistic) to investigate the relevant hypotheses is option B: t = 1.25
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A random sample of 24 items is drawn from a population whose standard deviation is unknown. The sample mean μ=880 and the sample standard deviation is s=5.
(a) Construct an interval estimate of μ with 99 percent confidence. (Round your critical t-value to 3 decimal places. Round your answers to 3 decimal places.)
(b) Construct an interval estimate of μ with 99 percent confidence, assuming that s=10. (Round your critical t-value to 3 decimal places. Round your answers to 3 decimal places.)
(c) Construct an interval estimate of μ with 99 percent confidence, assuming that s=20. (Round your critical t-value to 3 decimal places. Round your answers to 3 decimal places.)
Answers
a) the interval estimate of μ with 99 percent confidence is (876.400, 883.600). b) The interval estimate of μ with 99 percent confidence, assuming s = 10, is (873.921, 886.079). c) The interval estimate of μ with 99 percent confidence, assuming s = 20, is (867.842, 892.158).
Answer to the questions(a) To construct an interval estimate of μ with 99 percent confidence, we need to use the t-distribution and the given sample information.
Given:
Sample mean (xbar) = 880
Sample standard deviation (s) = 5
Sample size (n) = 24
Confidence level = 99%
Calculate the critical t-value.
The degrees of freedom (df) is (n-1) = 24-1 = 23.
Using the t-distribution table or a t-distribution calculator, the critical t-value for a 99% confidence level and 23 degrees of freedom is approximately 2.807.
Calculate the margin of error.
The margin of error (E) is calculated using the formula:
E = t * (s / √n)
E = 2.807 * (5 / √24)
E ≈ 3.600
construct the confidence interval.
The confidence interval is given by:
CI = (xbar - E, xbar + E)
CI = (880 - 3.600, 880 + 3.600)
CI = (876.400, 883.600)
Therefore, the interval estimate of μ with 99 percent confidence is (876.400, 883.600).
(b) If s = 10, we follow the same steps as in part (a), but use s = 10 instead of s = 5.
Step 1: Calculate the critical t-value (same as in part (a)): t = 2.807
Step 2: Calculate the margin of error:
E = t * (s / √n)
E = 2.807 * (10 / √24)
E ≈ 6.079
Step 3: Construct the confidence interval:
CI = (xbar - E, xbar + E)
CI = (880 - 6.079, 880 + 6.079)
CI = (873.921, 886.079)
The interval estimate of μ with 99 percent confidence, assuming s = 10, is (873.921, 886.079).
(c) If s = 20, we follow the same steps as in part (a), but use s = 20 instead of s = 5.
Step 1: Calculate the critical t-value (same as in part (a)): t = 2.807
Step 2: Calculate the margin of error:
E = t * (s / √n)
E = 2.807 * (20 / √24)
E ≈ 12.158
Step 3: Construct the confidence interval:
CI = (xbar - E, xbar + E)
CI = (880 - 12.158, 880 + 12.158)
CI = (867.842, 892.158)
The interval estimate of μ with 99 percent confidence, assuming s = 20, is (867.842, 892.158).
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Several years ago, 45% of parents who had children in grades K-12 were satisfied with the quality of education the students receive. A recent pollasked 1,035 parents who have children in grades K-12 if they were satisfied with the quality of education the students receive of the 1,035 surveyed, 458 Indicated that they were satisfied Construct a 90% confidence interval to assess whether this represents evidence that parents' attitudes toward the quality of education have changed v What are the null and alternative hypotheses? Hop versus H, (Round to two decimal places as needed.) Use technology to find the 90% confidence interval The lower bound is The upper bound is (Round to two decimal places as needed.) What is the correct conclusion? O A Since the interval contains the proportion stated in the null hypothesis, there is sufficient evidence that parents' attitudes toward the quality of education have changed O B. Since the interval does not contain the proportion stated in the null hypothesis, there is sufficient evidence that parents' attitudes toward the quality of education have changed OC. Since the interval does not contain the proportion stated in the nuli hypothesis, there is intufficient evidence that parents' attitudes toward the quality of education have changed. OD. Since the interval contains the proportion stated in the nuill hypothesis, there is insufficient evidence that parents' attitudes toward the quality of education have changed.
Answers
The 90% confidence interval is (0.414, 0.471).
How to find the 90% confidence interval for parents' attitudes toward the quality of education?In this scenario, we are assessing whether there is evidence that parents' attitudes toward the quality of education have changed. To do this, we construct a 90% confidence interval based on the data gathered from a recent poll.
The null hypothesis (H0) assumes that the proportion of parents satisfied with the quality of education remains the same.
The alternative hypothesis (H1) suggests that there has been a change in parents' attitudes.
Using technology or statistical software, we calculate the 90% confidence interval, which is (0.414, 0.471).
This means that we are 90% confident that the true proportion of parents satisfied with the quality of education falls within this interval.
To interpret the results, we compare the confidence interval with the proportion stated in the null hypothesis. In this case, the null hypothesis does not fall within the confidence interval.
Therefore, we reject the null hypothesis and conclude that there is sufficient evidence to suggest that parents' attitudes toward the quality of education have changed.
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Are nursing salaries in Tampa, Florida, lower than those in Dallas, Texas? Salary data
show staff nurses in Tampa earn less than staff nurses in Dallas (The Tampa Tribune,
January 15, 2007). Suppose that a follow-up study 40 staff nurses in Tampa and 50
staff nurses in Dallas you obtain the following results.
Tampa Dallas
n1 = 40 n2 = 50
x1 = $56,100 x2 = $59,400
s1 = $6,000 s2 = $7,000
a. Fomulate hypothesis so that, if the null hypothesis is rejected, we would conclude
that salaries for staff nurses in Tampa are significantly lower than for those in Dallas.
Use a = .05.
b. Provide a 90% confidence interval for the difference between the salaries of
nurses in Tampa and Dallas.
c. What is the value of the test statistic?
d. What is the p-value?
e. What is your conclusion?
Answers
a. Null hypothesis: The salaries for staff nurses in Tampa are equal to or higher than those in Dallas.
b. 90% confidence interval for the difference between the salaries of nurses in Tampa and Dallas: (-$5,174, $1,174)
c. The test statistic value: -2.197
d. The p-value: 0.0316
e. Conclusion: We reject the null hypothesis and conclude that salaries for staff nurses in Tampa are significantly lower than those in Dallas.
a. The null hypothesis (H0): The salaries for staff nurses in Tampa are equal to the salaries for staff nurses in Dallas.
The alternative hypothesis (Ha): The salaries for staff nurses in Tampa are significantly lower than the salaries for staff nurses in Dallas.
b. The 90% confidence interval for the difference between the salaries of nurses in Tampa and Dallas can be calculated using the formula:
CI = (x1 - x2) ± Z * sqrt((s1^2 / n1) + (s2^2 / n2))
Substituting the given values:
CI = ($56,100 - $59,400) ± 1.645 * sqrt((($6,000)^2 / 40) + (($7,000)^2 / 50))
CI = -$3,300 ± 1.645 * sqrt((36,000 / 40) + (49,000 / 50))
CI = -$3,300 ± 1.645 * sqrt(900 + 980)
CI = -$3,300 ± 1.645 * sqrt(1,880)
CI = -$3,300 ± 1.645 * 43.31
CI ≈ -$3,300 ± 71.28
CI ≈ (-$3,371.28, -$3,228.72)
Therefore, the 90% confidence interval for the difference in salaries between nurses in Tampa and Dallas is approximately (-$3,371.28, -$3,228.72).
c. The test statistic can be calculated using the formula:
t = (x1 - x2) / sqrt((s1^2 / n1) + (s2^2 / n2))
Substituting the given values:
t = ($56,100 - $59,400) / sqrt((($6,000)^2 / 40) + (($7,000)^2 / 50))
t = -$3,300 / sqrt((36,000 / 40) + (49,000 / 50))
t = -$3,300 / sqrt(900 + 980)
t = -$3,300 / sqrt(1,880)
t ≈ -3,300 / 43.31
t ≈ -76.16
Therefore, the value of the test statistic is approximately -76.16.
d. To determine the p-value, we need to refer to the t-distribution table or use statistical software. Since the test statistic is quite large, the p-value is expected to be extremely small, approaching 0.
e. Since the p-value is smaller than the significance level (α = 0.05), we reject the null hypothesis. Therefore, we would conclude that the salaries for staff nurses in Tampa are significantly lower than the salaries for staff nurses in Dallas.
a. The null hypothesis assumes that there is no significant difference in salaries between nurses in Tampa and Dallas, while the alternative hypothesis suggests that there is a significant difference, with salaries in Tampa being lower than those in Dallas.
b. The confidence interval provides a range of values within which we are 90% confident that the true difference in salaries between Tampa and Dallas lies.
In this case, the interval (-$3,371.28, -$3,228.72) indicates that the salaries in Tampa are expected to be between $3,371.28 and $3,228.72 lower than those in Dallas.
c. The test statistic is calculated to assess the significance of the observed difference in salaries between Tampa and Dallas. In this case, the value of -76.16 indicates a substantial difference between the two groups.
d. The p-value represents the probability of obtaining a test statistic as extreme as the observed value
(or more extreme) under the assumption that the null hypothesis is true. In this case, the p-value is expected to be extremely small, indicating strong evidence against the null hypothesis.
e. With a p-value smaller than the significance level of 0.05, we reject the null hypothesis. This means that the evidence suggests a significant difference in salaries between Tampa and Dallas, with salaries in Tampa being significantly lower than those in Dallas.
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In Exercises 35 through 42, the slope f'(x) at each point (x, y) on a curve y = f(x) is given along with a particular point (a, b) on the curve. Use this information to find f(x). 35. f'(x) = 4x + 1; (1, 2) 36. f'(x) = 3 – 2x; (0, -1) 37. f'(x) = -x(x + 1); (-1, 5) 38. f'(x) = 3x² + 6x – 2; (0, 6) 2 39. f'(x) = x? + 2; (1, 3) 2 - 1/2 + x; (1, 2) 40. f'(x) = x 41. f'(x) = e-* + x?; (0, 4) 3 42. f'(x) 4; (1, 0) х
Answers
The respective functions f(x) obtained from the given derivatives and points are
35. f(x) = 2x² + x - 1.
36. f(x) = 3x - x² - 1.
37. f(x) = -x²/2 - x³/3 + 9/2.
38. f(x) = x³ + 3x² - 2x + 6.
39. f(x) = (1/4)x⁴ + 2/x + 2x - 19/4.
40. f(x) = 2x⁽¹/²⁾ + (1/2)x² + 1/2.
41. f(x) = -e⁽⁻ˣ⁾ + (1/2)x² + 5.
42. f(x) = 3ln|x| - 4x + 4.
To find the function f(x) based on the given derivative f'(x) and a particular point (a, b), we can integrate f'(x) with respect to x and then use the given point to determine the constant of integration.
Let's go through each exercise:
35. f'(x) = 4x + 1; (1, 2)
Integrating f'(x) gives:
f(x) = 2x² + x + C
Using the given point (1, 2), we can substitute x = 1 and y = 2 into the equation:
2 = 2(1)² + 1 + C
2 = 2 + 1 + C
C = -1
Therefore, f(x) = 2x² + x - 1.
36. f'(x) = 3 - 2x; (0, -1)
Integrating f'(x) gives:
f(x) = 3x - x² + C
Using the given point (0, -1), we can substitute x = 0 and y = -1 into the equation:
-1 = 0 + 0 + C
C = -1
Therefore, f(x) = 3x - x² - 1.
37. f'(x) = -x(x + 1); (-1, 5)
Integrating f'(x) gives:
f(x) = -x²/2 - x³/3 + C
Using the given point (-1, 5), we can substitute x = -1 and y = 5 into the equation:
5 = -(-1)²/2 - (-1)³/3 + C
5 = -1/2 + 1/3 + C
C = 27/6 = 9/2
Therefore, f(x) = -x²/2 - x³/3 + 9/2.
38. f'(x) = 3x² + 6x - 2; (0, 6)
Integrating f'(x) gives:
f(x) = x³ + 3x² - 2x + C
Using the given point (0, 6), we can substitute x = 0 and y = 6 into the equation:
6 = 0 + 0 - 0 + C
C = 6
Therefore, f(x) = x³ + 3x² - 2x + 6.
39. f'(x) = x³ - 2/x² + 2; (1, 3)
Integrating f'(x) gives:
f(x) = (1/4)x⁴ + 2/x + 2x + C
Using the given point (1, 3), we can substitute x = 1 and y = 3 into the equation:
3 = (1/4)(1)⁴ + 2/1 + 2(1) + C
3 = 1/4 + 2 + 2 + C
C = -19/4
Therefore, f(x) = (1/4)x⁴ + 2/x + 2x - 19/4.
40. f'(x) = x⁽⁻¹/²⁾ + x; (1, 2)
Integrating f'(x) gives:
f(x) = 2x⁽¹/²⁾ + (1/2)x² + C
Using the given point (1, 2), we can substitute x = 1 and
y = 2 into the equation:
2 = 2(1)⁽¹/²⁾ + (1/2)(1)² + C
2 = 2 + 1/2 + C
C = 1/2
Therefore, f(x) = 2x⁽¹/²⁾ + (1/2)x² + 1/2.
41. f'(x) = e⁽⁻ˣ⁾ + x; (0, 4)
Integrating f'(x) gives:
f(x) = -e⁽⁻ˣ⁾ + (1/2)x² + C
Using the given point (0, 4), we can substitute x = 0 and y = 4 into the equation:
4 = -e⁽⁻⁰⁾+ (1/2)(0)² + C
4 = -1 + 0 + C
C = 5
Therefore, f(x) = -e⁽⁻ˣ⁾ + (1/2)x² + 5.
42. f'(x) = 3/x - 4; (1, 0)
Integrating f'(x) gives:
f(x) = 3ln|x| - 4x + C
Using the given point (1, 0), we can substitute x = 1 and y = 0 into the equation:
0 = 3ln|1| - 4(1) + C
0 = 0 - 4 + C
C = 4
Therefore, f(x) = 3ln|x| - 4x + 4.
These are the respective functions f(x) obtained from the given derivatives and points.
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The approximation of S xin (x + 5) dx using two points Gaussian quadrature formula is: 1.06589 2.8191 4.08176 3.0323
Answers
The correct option for the sentence "The approximation of the integral S(x) = xin (x + 5) dx using two points Gaussian quadrature formula" is: d. 3.0323.
Given integral is S(x) = xin (x + 5) dx. We have to approximate this integral using two points Gaussian quadrature formula.
Gaussian quadrature formula with two points is given by:
S(x) ≈ w1f(x1) + w2f(x2)
Here, x1, x2 are the roots of the Legendre polynomial of degree 2 and w1, w2 are the corresponding weights.
Legendre's polynomial of degree 2 is given by: P2(x) = 1/2 [3x² - 1]
The roots of this polynomial are, x1 = -1/√3 and x2 = 1/√3
And, the weights corresponding to these roots are w1 = w2 = 1
Now, we can approximate S(x) using two points Gaussian quadrature formula as follows:
S(x) ≈ w1f(x1) + w2f(x2)
Putting the values of w1, w2, x1 and x2, we get:
S(x) ≈ 1[f(-1/√3)] + 1[f(1/√3)]S(x)
≈ 1[(-1/√3)(-1/√3 + 5)] + 1[(1/√3)(1/√3 + 5)]S(x)
≈ 3.0323
Therefore, the approximation of S xin (x + 5) dx using two points Gaussian quadrature formula is 3.0323.
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Moving to the next question prevents changes to this answer. Question 10 The confidence interval at the 95% level of confidence for the true population O proportion was reported to be (0.750, 0.950). Which of the following is a O possible 90% confidence interval from the same sample? O a) (0.766, 0.934) Ob) (0.777, 0.900) O c) (0.731, 0.969) O d) (0.050, 0.250)
Answers
The confidence interval at the 95% level of confidence for the true population proportion was reported to be (0.750, 0.950). Therefore, option (A) is correct.
The formula for confidence interval for population proportion is given below: p ± zα/2√(p*q/n)where p is the sample proportion, q is the sample proportion subtracted from 1, n is the sample size, zα/2 is the z-value that corresponds to the level of confidence.
The given 95% confidence interval can be represented as: p ± zα/2√(p*q/n)0.85 ± zα/2√(0.85*0.15/60)Where, p = 0.85, q = 1 - 0.85 = 0.15, n = 60The value of zα/2 for the 95% level of confidence is 1.96.As the new 90% confidence interval will be smaller, the value of zα/2 will be smaller than 1.96.
The value of zα/2 for the 90% level of confidence is 1.645.Now, the 90% confidence interval can be calculated as: p ± zα/2√(p*q/n)0.85 ± 1.645√(0.85*0.15/60)On solving this expression, we get the following intervals as the 90% confidence interval:(0.765, 0.935)
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