The appropriate test to perform is one sample t test
The rejection reason is t statistic less than -2.012 or t statistic more than -2.012
The p value of the test is 0.0292
Firstly,
As the population standard deviation is unknown and the sample size is more than 30, it is appropriate to use one sample t test for this hypothesis testing
Testing if the mean is changed from 700 levels or not
Null and alternate hypothesis are 700
Degree of freedom,
n-1
= 48-1
= 47
Using alpha level 0.05 and t critical table, we found the following two critical values
t critical values= -2.012 and 2.012
So, the rejection reason is t statistic less than -2.012 or t statistic more than -2.012
Now,
Population means = 700 hours
Sample mean = 675 hours
n = 48
So,
Test statistic= (mean-alternate hypothesis)/(s/√n)
= (675-700)/ (77/√48)
=-25/11.1140
= -2.249
Degree of freedom = n-1
= 48-1
= 47
With t distribution table for -2.249 and 47 degrees of freedom obtain p value of 0.0292
So, pvalue= 0.0292
Reject null hypothesis since the p value is less than alpha level
So, we conclude that the mean has changed from 700 hours
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What’s the answer? pls hurry!
Answer:
Step-by-step explanation:
use (Y2-Y1)/(X2-X1)
(7-2)/(0-(-5))=5/5=1
y=1x+b is your equation with value b as the y intercept.
Plug in a point into this and solve for b
7=1(0)+b
7=b
final equation is y=x+7
A is the answer
PLSS can you help me and answers
A red and a blue die are thrown. Both dice are fair. The events A, B, and C are defined as follows: A: The sum on the two dice is even
B: The sum on the two dice is at least 10
C. The red die comes up 5
The probability of event A occurring is 1/2, the probability of event B occurring is 1/3, and the probability of event C occurring is 1/6.
in order for a sum of two dice to be even, the numbers on the two dice must add up to an even number. The possible combinations of two dice that add up to an even number are (1,3), (3,1), (2,4), (4,2), (5,5). Therefore, the probability of event A occurring is 1/2.
In order for the sum of two dice to be at least 10, the numbers on the two dice must add up to 10, 11, 12. The possible combinations of two dice that add up to 10, 11, 12 are (4,6), (6,4), (5,5), (5,6), (6,5). Therefore, the probability of event B occurring is 1/3.
In order for the red die to come up 5, the number on the other die does not matter. Therefore, the probability of event C occurring is 1/6.
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At the West Texas Balloon Festival in El Paso, a hot air balloon started its descent from an altitude of 800 feet. After 1 minute, it is at a height of 700 feet and continues at this rate till it reaches the ground.
A. Write a linear equation to find the height, h of the balloon after m minutes.
B. What is the rate of change. What does it represent in this situation?
C. What is the y-intercept and what does it represent?
D. What is the x-intercept and what does it represent?
The linear equation and the definition of the parts of the equation of the motion of the balloon are as follows;
A. The equation is; h = 800 - 100·m
B. The rate of change is 100 ft/min. The rate of change represents the height the balloon descends in one minute
C. The y-intercept is 800 (feet). The y-intercept represents the initial height of the balloon
D. The x-intercept is 8 (minutes). The x-intercept represents the time it takes the balloon to reach the ground
What is a linear equation?A linear equation is one that has a straight line graph.
The initial height of the balloon = 800 feet
Height of the balloon after 1 minute = 700 feet
A. The change in height of the balloon in one minute = 100 feet
The rate of change of the height of the balloon = -100 feet per minute (the height reduces by 100 feet after each minute)
The linear equation for the balloon, can therefore be obtained from the following details;
The initial height of the balloon = The y-intercept of the linear equation, c = 800 feet
The rate of change of the height of the balloon = The slope of the linear equation, m = -100 ft/min
The linear equation in the form, y = m·x + c, that can be used to find the height of the balloon is therefore;
h = -100·m + 800
h = 800 - 100·mB. The rate of change is the rate at which the height of the balloon changes, which is 100 feet per minute
The rate of change represents the slope of the linear equation and the rate at which the height of the balloon reduces.C. The y-intercept is the point at which the linear equation intersects the y-axis which is the point at which the input variable, m, is zero, indicating the height at which the balloon started its descent.
Therefore, the y-intercept represents the initial height of the balloonD. The x-intercept is the point at which the graph intersects the x-axis, and at which the y-value (value of the output variable) is zero, and the x-intercept can be specified by the x-value at the point of the intersection.
At the x-intercept, therefore, h is zero, which is the ground level, and m is the time it takes the balloon to reach the ground.
At the x-intercept, therefore, we het;
h = 0 = 800 - 100·m
100·m = 800
m = 800 ÷ 100 = 8
The x-intercept is m = 8 minutes
The x-intercept therefore, represents the time (8 minutes) it takes the balloon to reach the ground.Learn more about graphs of linear equations here:
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whats the geometric mean of 6 and 28
Answer:
Geometric mean: 12.961481396816
Evaluate the expression using De Moivre’s Theorem: √2+3i
Give your answer in a+bi form.
Answer:
cos(π/2)+isin(π/2)
Step-by-step explanation:
hopefully that's the answer you're looking for, haven't done problems like this in a while-
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The product of 9 and the difference of a number and 7.
Answer:
I
Submit Answer
Answer:
9x-63
Step-by-step explanation:
9*(x-7)
9x-63
2x5−x3+x2+4; reflection in the y-axis and a vertical stretch by a factor of 3, followed by a translation 1 unit down
3x2-3(y+1)+9x2+12; reflection in the y-axis, a vertical stretch by a factor of 3, and a translation 1 unit down
The reflection in the y-axis can be achieved by changing the sign of the x-terms while leaving the y-term unchanged. Afterwards, the function needs to be stretched vertically by a factor of 3. This means that all terms will be multiplied by 3. Lastly, the function requires a translation 1 unit down. This can be done by adding a -1 to the y-term. Therefore, the final equation is 3x2-3(y+1)+9x2+12 which includes the reflection in the y-axis, vertical stretch by a factor of 3, and translation 1 unit down.
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How do I find the area between the curves of y=x+2 and y=x^{2}-2?
Refer to the attached photos. I would appreciate a rate :)
What is the midpoint overline AB with A (2, 4) and B (- 6, 8) Mid Point Formula ((x_{1} + x_{2})/2, (y_{1} + y_{2})/2)
If the midpoint of AB with A (2, 4) and B (- 6, 8) is at point (-2, 6)
How to find the midpointThe formula to determine the center point of a straight line using the coordinates of its endpoints is known as the midpoint formula in coordinate geometry.
The formula is of the form
X= (x₂ + x₁)/2
Y = (y₂ + y₁)/2
solving for the midpoint
X= (2 - 6) / 2
X = -4 / 2
X = -2
Y = (y₂ + y₁)/2
Y = (4 + 8) / 2
Y = 12 / 2
Y = 6
The midpoint is (-2, 6)
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Graph: y < -1
Is (-2,5) a solution? yes or no
Is ( 6,2) a solution? yes or no
Answer: Both points are not a solution.
Step-by-step explanation:
This says that the graph will be every y-value less than -1. Both 5 (in the point (-2, 5)) and 2 (in the point (6, 2)) are greater than -1, meaning they are both not a solution.
See attached for a graph with the coordinate points graphed as well. Since these points are not in the shaded region, they are not solutions.
To find a value that is in an unordered array of 100 items, how many values must linear search examine on average?
a) 101
b) 100
c) 7
d) 50
e) 10
Answer: D its 50
Step-by-step explanation:
Solve For X, using the degrees given in the equation.
x= 101°.
Step-by-step explanation:1. Refer to the theory.Theory of triangles states that the sum of all inner angles of a triangle should equal 180°. Hence, you can make an equation that gives the missing value of "x" in this problem.
2. Form the equation.[tex]x+30+49=180[/tex]
3. Solve the equation.[tex]x=180-30-49\\ \\x=101[/tex]
4. Conclude.x= 101°.
the updated forecast for the amazon sales accounting for trend, seasonality and adjusted for the serial correlation using the ar(1) model is: billion dollars. if the answer is 75.2432 billion dollars just type 75.243 keep at least 3 decimal places for all parts of your calculation. record your answer with at least 3 decimal places.
As per the forecast, the updated forecast for the amazon sales accounting for trend, seasonality and adjusted for the serial correlation using the AR(1) model is 75.243.
In statistics, the term correlation defines the degree to which two variables move in coordination with one another.
Here we have Quarterly Amazon Sales (billion dollars) starting in Quarter 3 of 2013 through Quarter 2 of 2021 . And assume in Quarter 2 of 2021 the Amazon Sales were 96.6 billion dollars.
Now we have to use the output provided below to report the updated forecast for the Amazon Sales for Quarter 3 of 2021.
Here the variable time period is coded in the following way:
Start with
t=1 for Quarter 3 of 2013,
t=2 for Quarter 4 of 2013 .
Then the value of t will increase by 1 for each subsequent quarter.
Here in this example we have created indicator variables for Quarters 1, 2 and 3. Quarter 4 is the base level.
Now, by using the output here for the model accounting for trend and seasonality as well as the output for the AR(1) model report the updated forecast for Amazon Sales in Quarter 3 of 2021.
Here the subset of the output posted below: Response Revenues Bivariate Fit of Residual Revenues $2 By Lag residuals Parameter Estimates
Therefore, the Updated forecast for the Amazon Sales accounting for Trend, Seasonality and Adjusted for the Serial Correlation using the AR(1) model is 75.243
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(20x³+12x² +17x-17)÷(5x²-2x)
The division of the given polynomial is [tex]\frac{20x^3+12x^2+17x-17}{5x^2-2x}=4x+4+\frac{25x-17}{5x^2-2x}[/tex].
What is a long division of polynomials?
A long-division polynomial is an algorithm for dividing polynomials by another polynomial of the same or a lower degree. The long division of polynomials also consists of the divisor, quotient, dividend, and the remainder as in the long division method of numbers.
The given expression is (20x³ + 12x² + 17x - 17) ÷ (5x² - 2x)
[tex]=\frac{20x^3+12x^2+17x-17}{5x^2-2x}\\\\=4x+\frac{20x^2+17x-17}{5x^2-2x}\\\\=4x+4+\frac{25x-17}{5x^2-2x}\\[/tex]
Hence, the division of the given polynomial is [tex]\frac{20x^3+12x^2+17x-17}{5x^2-2x}=4x+4+\frac{25x-17}{5x^2-2x}[/tex].
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TRUE/FALSE. when we conduct time series forecasting it is safest to utilize regression analysis, because then we will not be extrapolating.
When we conduct time series forecasting it is safest to utilize regression analysis, because then we will not be extrapolating the above statement is False.
Regression analysis is a group of analytical techniques used to measure the relationships between a dependent variable and one or more independent variables. It may be used to simulate the long-term link between variables and gauge how strongly the relationships between them are related.
Models that evaluate the connection between a dependent variable and an independent variable include simple linear regression. The following equation represents the simple linear model:
Y = a + bX + ϵ
Regression analysis is the most secure method for time series forecasting since it involves extrapolation.
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Find Mean, Median, and Mode
What is the mean, median, and mode of the data in this set?
0.1,12.3,2.4,10.1,4.5,6.2
For the data in the given set , the mean is 7.6 , the median is 8.15 and the median is 10.1 .
In the question ,
the data in the set is given as 10.1 , 12.3 , 2.4 , 10.1 , 4.5 , 6.2 .
on arranging data set in ascending order ,
we get , 2.4 , 4.5 , 6.2 , 10.1 , 10.1 , 12.3 .
the sum is = 45.6
the mean is = sum /(number of terms)
= 45.6/6
= 7.6
the data has 6 numbers of terms
So ,the median will be (3rd term + 4th term)/2
= (6.2 + 10.1)/2
= 16.3/2
= 8.15
the term 10.1 occurs most number of time that is two times .
So , the mode is 10.1 .
Therefore , the mean is 7.6 , median is 8.15 and mode is 10.1 .
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which ones have no solution?
Answer:b,d
Step-by-step explanation:
help please
One angle measures 25° and another angle measures (3d − 10)°. If the angles are complementary, what is the value of d?
d = 55
d = 35
d = 25
d = 11.7
If the angles are complementary, the value of d is C. d = 25.
What are complementary angles?Complementary angles are two angles whose measures add up to 90° . In the figure below, ∠1 and ∠2 are complementary. Two angles need not be adjacent to be complementary. When the sum of two angles is equal to 90 degrees, they are called complementary angles. For example, 30 degrees and 60 degrees are complementary angles
In this case, it will be:
25 + 3d - 10 = 90
3d + 15 = 90
Collect like terms
3d = 90 - 15.
3d = 75.
Divide
d = 75/3
d = 25
The correct option is C.
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Round 3.122 to the nearest hundredth
Answer:
3.12
Step-by-step explanation:
1 number after the decimal - tenths place.
2 numbers after the decimal - hundredths place.
3 numbers after the decimal - thousandths place.
4 numbers after the decimal - ten thousandths place.
5 numbers after the decimal - hundred thousandths place.
Answer:
3.12
Step-by-step explanation:
3.122 rounds up to 3.12 because 2 is less than 5, so the number rounds down.
i need help asap!!! please help me i don’t know how to do this!!
Solve:
19) m∠2 = 12x-4
For the given isosceles triangle when we solve m < 2 = 12x - 4 we get the value of x = 4.5 degrees.
It is known that two sides are equal so it is a isosceles triangle so the two angles are equal, that is
m<2 = 50
50 = 12x - 4
50 + 4 = 12x
54 = 12x
Divide by 12 on both sides
54 / 12 = 12 x / 12
x = 54 / 12
= 27 / 6
= 9 / 2
= 4.5 degrees
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Name: Sally Jonas, single, 1 exemption.
Pay Rate: $5.95 per hour
Hours Worked: M-8, T-7, W-8, T-9, F-8
Total Hours Worked :
Wage for Week :
FICA Tax (7.65 %) :
Federal Tax :
State Income Tax (at 3%) :
City Income Tax (1.5%) :
Total Tax :
Paycheck after Taxes :
Total hours worked: $40
Wage for Week: $238
FICA Tax (7.65%): $18.21
Federal Tax (from Table): $41.60
State Income Tax (at 3%): $7.14
City Income Tax (1.5%): $3.57
Total Tax: $70.52
Paycheck after Taxes: $167.48
et h be the set of all points of the form (s, s-1). determine whether h is a vector space. if it is not a vector space, determine which of the following properties it fails to satisfy. a: contains zero vector b: closed under vector addition c: closed under multiplication by scalars
No, h is not a vector space. It fails to satisfy property (b), closed under vector addition.
For a set to be a vector space, it must satisfy three properties: contains the zero vector, closed under vector addition and closed under multiplication by scalars.
For a set to be closed under vector addition, the sum of any two vectors in the set must also be in the set. In this case, the set h contains the points (s, s-1).
When two points are added, the result is (2s, 2s-2), which is not in the set h. Therefore, h fails to satisfy property (b) and is not a vector space.
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Describe the transformation of the parent
function f(x) = x³, to obtain the function
g(x) = (x − 8)³ + 4.
The transformation from the parent function is a translation by 8 units right and 4 units up
How to describe the transformation from the parent function?From the question, we have the following function that can be used in our computation:
f(x) = x³
g(x) = (x − 8)³ + 4
First, we have the transformation to be:
From f(x) = x³ to f'(x) = (x − 8)³
This means the function is translated right by 8 units
Next, we have:
From f'(x) = (x − 8)³ to g(x) = (x − 8)³ + 4
This means the function is translated up by 4 units
Hence, the transformation is 8 units right and 4 units up
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A football match consists of two 45 minute halves and a 30 minute break in between. How many minutes does the whole match last for?
The whole match lasts for 45 minutes + 45 minutes + 30 minutes = 120 minutes. Answer: 120 min.
Harry and Sally both invest $2500 for their
school tuition in 3 years. Harry chooses to
invest his money at bank A at 2.5%/a
compounded monthly while Sally chooses
to invest her money at bank B at 2.75%/a
compounded quarterly. How much money
will Harry and Sally have in their bank
account after 3 years? Who made the best
investment? Explain your answer.
The amount Harry has in his account is $2,694.50
The amount Sally has in his account is $2,714.23.
Sally made the best investment.
What is compound interest?It is the interest we earned on the interest.
The formula for the amount earned with compound interest after n years is given as:
A = P [tex](1 + r/n)^{nt}[/tex]
P = principal
R = rate
t = time in years
n = number of times compounded in a year.
We have,
Harry:
P = $2500
T = 3 years
r = 2.5%
n = 12
A = 2500 [tex](1 + 0.208)^{36}[/tex]
A = 2500 x [tex]1.208^{36}[/tex]
A = $2,694.50
Sally:
P = $2500
T = 3 years
r = 2.75%
n = 4
A = 2500 [tex](1 + 0.69)^{12}[/tex]
A = 2500 x [tex]1.69^{12}[/tex]
A = $2,714.23
Thus,
Harry has $2,694.50 in his account.
Sally has $2,714.23 in his account.
Sally made the best investment.
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The ultimate goal of muted group theory is to:A. Help men understand the perspective of women. B. Elect women to major leadership positions in Western democracies. C. Change linguistic systems that make it more difficult for women to be heard. D. Predict how women and men will communicate across gender lines.C. Change linguistic systems that make it more difficult for women to be heard.(The feminist dictionary is one attempt to create an alternative vocabulary.)
The question mentions muted group theory, which is a kind of Communication Theory. The answer is option C, which changes linguistic systems that make it more difficult for women to be heard.
A verbal system is a language taken as a combination of its corridor. A verbal system can also relate to a set of choices that druggies of language have in contriving rulings.
Muted group proposition is the introductory idea, articulated by anthropologists Ardener and Ardener, that in every society there are artistic groups who are traditionally muted — given lower access than members of the dominant groups to public converse and to having their individual and community enterprises heard.
Muted group proposition is the introductory idea, that in every society there are artistic groups who are traditionally muted — given lower access than members of the dominant groups to public converse and to having their individual and community enterprises heard.
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I need help with this question!!
Answer:
(b) 0.058 or 5.8%
Step-by-step explanation:
Given a normal distribution with mean 10.72 and standard deviation 0.14, you want the probability that a value is less than 10.5.
Probability calculatorA suitable probability calculator needs to know the mean, standard deviation, and set of values of interest. Here, ...
mean = 10.72
standard deviation = 0.14
P(X < 10.5)
The calculator shows it to be 0.058, or 5.8%.
Triangles U V W and X Y Z are shown. Angles V U W and Z X Y are congruent, angles U W V and X Z P are congruent, and angles U V W and Z Y X are congruent. The length of side U V is 50, the length of V W is 60, and the length of U W is 40. The length of side Z Y is 48, the length of Y X is 40, and the length of Z X is 32.
Which statement best describes triangles UVW and XYZ?
They are similar and congruent.
They are similar, but not congruent.
They are congruent, but not similar.
They are neither congruent nor similar.
The statement that best describes triangles UVW and XYZ is; They are similar, but not congruent.
How to Identify Congruent Angles?
We are given that;
Angles VUW and ZXY are congruent.
Angles UWV and XZP are congruent.
Angles UVW and ZYX are congruent.
Now, the length of side UV is 50, the length of VW is 60, and the length of UW is 40. The length of side ZY is 48, the length of YX is 40, and the length of ZX is 32.
Here the triangles are similar by the AAA similarity and the length of the first triangle is in the ratio 40:50:60 = 4:5:6 .
The side of the second triangle is also in the ratio 32:40:48 = 4:5:6 .
Therefore, the triangles UVW and XYZ are similar but not congruent.
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Answer:
B. They are similar, but not congruent