The equation that states (x, y) is equidistant from (4, 1) and the x-axis is -8x - 2y + 17 = 0.
To express that the point (x, y) is equidistant from both the point (4, 1) and the x-axis, we can set up an equation using the distance formula.
The distance formula states that the distance between two points (x₁, y₁) and (x₂, y₂) is given by:
d = √((x₂ - x₁)² + (y₂ - y₁)²)
In this case, we want the distance from (x, y) to (4, 1) to be equal to the distance from (x, y) to the x-axis. The x-axis can be represented by the equation y = 0.
Let's set up the equation:
√((x - 4)² + (y - 1)²) = √((x - x)² + (y - 0)²)
Simplifying, we get:
√((x - 4)² + (y - 1)²) = √(x² + y²)
To remove the square roots, we can square both sides of the equation:
((x - 4)² + (y - 1)²) = (x² + y²)
Expanding and simplifying further, we have:
x² - 8x + 16 + y² - 2y + 1 = x² + y²
Combining like terms, we obtain:
-8x - 2y + 17 = 0
Therefore, the equation that states (x, y) is equidistant from (4, 1) and the x-axis is -8x - 2y + 17 = 0.
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i need help. what’s the answer to this .
Answer:
12
Step-by-step explanation:
I know bc i did this before
Answer:
72 unit cubes (72 units³)
Step-by-step explanation:
[tex]6\times3\times4=72[/tex]
what is the volume of this sphere? Use a 3.14 and round your answer to the nearest hundredth. cubic feet Submit Work it out Not feeling ready yet? This Area of circles 47)
Answer:
4.19 cubic feet
Step-by-step explanation:
Sample mean = 5.5, 8=2.517. df-8 and confidence level 95% (corresponding test statistic value is 2303). Based on this information answer the following: Which test is appropriate, z-test or t-test? Type either "z-test" or "t-test" t-test Ą What was the sample size? A Calculate the margin of error. (Report two decimal point, #.##) A Calculate the confidence interval-write lower and uppler value using comma.(Report two decimal point: #.##, #.##) Ą If the df increases to 30 then what will impact on the margin of error? Write either "increase" or "decrease" or "no change decrease ^ If the df increases to 30 then what will impact on the confidence interval? Write either "wide" or "narrow" or "no change" decrease A/
The confidence interval is (4.25, 6.75). If the df increases to 30 then the impact on the margin of error will decrease.
The test that is appropriate for the given values is the t-test since the sample size is small. The sample size is not given in the question but it is necessary to find the margin of error. Hence, the sample size can be found using the formula of the t-test. Let us recall the formula of the t-test below:t = (sample mean - population mean) / (sample standard deviation / √n)
Where,t = test statistic sample mean = 5.5population mean = 8sample standard deviation = 2.517confidence level = 95%corresponding test statistic value = 2.303Let's plug in all the values in the formula and solve for the sample size,n = ((sample mean - population mean) / (sample standard deviation/test statistic value))²= ((5.5 - 8) / (2.517 / 2.303))²= 3.484²≈ 12.11Hence, the sample size is 12.11 or approximately 12.
Now, let's calculate the margin of error using the formula below: Margin of error = (t-critical value) × (standard deviation / √n)Since the confidence level is 95%, the alpha level is 5% which is divided equally between the two tails, so the area in each tail is 2.5%. Using the t-distribution table with df = n-1 = 11 and alpha/2 = 0.025, the t-critical value is 2.201.
Let's plug in all the values in the formula of the margin of error and solve it: Margin of error = (t-critical value) × (standard deviation / √n)= 2.201 × (2.517 / √12)= 1.245 ≈ 1.25Therefore, the margin of error is 1.25.
The confidence interval can be calculated using the formula below: Confidence interval = (sample mean - margin of error, sample mean + margin of error)Confidence interval = (5.5 - 1.25, 5.5 + 1.25)= (4.25, 6.75)Hence, the confidence interval is (4.25, 6.75).If the df increases to 30 then the impact on the margin of error will decrease. If the pdf increases to 30, then the impact on the confidence interval will be narrow.
So, the confidence interval is (4.25, 6.75).If the df increases to 30 then the impact on the margin of error will decrease.
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Given that x=6.2•10^12 and y=2•10^-8, find the value of x•2y
Answer:
Step-by-step explanation:
Cost of a cell phone: $249.50
Markup: 30%
Answer:
$324.35
Step-by-step explanation:
249.50 x 1.30 = $324.35
please help anybody it would help alot
Determine Px H=34, o=12, n=35 ox (Round to three decimal places F and a from the given parameters of the population and sample size. 11 Determine and o from the given parameters of the population and sample size. u-34, a 12, n=35 K- (Round to three decimal places as needed).
The value of μₓ is 77 and σₓ is 3 when [tex]\mu[/tex] = 77, [tex]\sigma[/tex] = 21, and n = 49.
We have
[tex]\mu[/tex] = 77,
[tex]\sigma[/tex] = 21,
and Sample size, n = 49.
The formula to determine the sample mean (μₓ) is
=μx
= μ
=77
Similarly, σₓ= σ/(√(n))
Therefore, we substitute the given values,
σx = 21/(√(49))
σx= 3
The standard deviation is a statistical metric used to quantify the extent of variation or dispersion within a dataset. It gauges the degree to which values deviate from the average (mean) value.
A larger standard deviation suggests a greater degree of variability, while a smaller standard deviation suggests less variability.
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The current in a stream moves at a speed of 5 km/h. A boat travels 20 km upstream and 20 km downstream in a total of 3 hours. Find the speed of the boat in still water.
Answer:
14
Step-by-step explanation:
im right
Two very long, parallel wires are separated by d = 0.065 m. The first wire carries a current of I1 = 0.65 A. The second wire carries a current of I2 = 0.35 A.
1) Express the magnitude of the force between the wires per unit length, f, in terms of I1, I2, and d.
2)Calculate the numerical value of f in N/m.
3)Is the force repulsive or attractive?
4) Express the minimal work per unit length needed to separate the two wires from d to 2d.
5)Calculate the numerical value of w in J/m.
1. The work magnitude of the force between the wires per unit length, f, can be expressed using Ampere's Law:
f = μ₀ * I₁ * I₂ / (2πd)
2. The numerical value of f is 2 × 10⁻⁶ N/m.
3. Since the currents I₁ and I₂ are both positive, the force between the wires will be attractive.
4. The minimal work per unit length needed to separate the two wires from d to 2d can be calculated using the equation:
W = f * (2d - d) = f * d.
5. The numerical value of the minimal work per unit length needed to separate the two wires from d to 2d is 1.3 × 10⁻⁷ J/m.
What is Ampère's law?Ampère's law, one of the fundamental correlations between electricity and magnetism, quantifies the relationship between an electric field's changing magnetic field and the electric current that creates it.
1. The work magnitude of the force between the wires per unit length, f, can be expressed using Ampere's Law:
f = μ₀ * I₁ * I₂ / (2πd),
where μ₀ is the permeability of free space, I₁ and I₂ are the currents in the wires, and d is the separation between the wires.
2. To calculate the numerical value of f in N/m, we need to substitute the given values into the formula:
μ₀ = 4π × 10⁻⁷ T·m/A (permeability of free space)
f = (4π × 10⁻⁷ T·m/A) * (0.65 A) * (0.35 A) / (2π * 0.065 m)
Simplifying:
f = 2 * 10⁻⁶ N/m
Therefore, the numerical value of f is 2 × 10⁻⁶ N/m.
3. The force between the wires is attractive when the currents flow in the same direction and repulsive when the currents flow in opposite directions. In this case, since the currents I₁ and I₂ are both positive, the force between the wires will be attractive.
4. The minimal work per unit length needed to separate the two wires from d to 2d can be calculated using the equation:
W = f * (2d - d) = f * d.
5. Substituting the value of f (2 × 10⁻⁶ N/m) and d (0.065 m) into the equation, we get:
W = (2 × 10⁻⁶ N/m) * (0.065 m)
Simplifying:
Work = 1.3 × 10⁻⁷ J/m
Therefore, the numerical value of the minimal work per unit length needed to separate the two wires from d to 2d is 1.3 × 10⁻⁷ J/m.
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Let p be a prime and let f(x,y) be a polynomial of degree 2 whose only 0 in Z/pZ is 0 (the trivial) (Has no zero divisors).
i) Explain why f(ka,kb) = k^2f(a,b).
ii) Use i) to prove that if a is not 0 mod p, then f(x,y) is congruent to a mod p always has a solution.
Given a prime number p and a polynomial f(x, y) of degree 2 with the only zero in Z/pZ being 0, we can show that f(ka, kb) = k^2f(a, b) using properties of polynomials.
i) To show that [tex]f(ka, kb) = k^2f(a, b)[/tex], we consider the polynomial f(x, y) and apply the properties of polynomials. Since f(x, y) has a degree of 2, we can write it as [tex]f(x, y) = ax^2 + bxy + cy^2,[/tex] where a, b, and c are coefficients. Now, substituting ka for x and kb for y, we get f(ka, kb) = [tex]a(ka)^2 + b(ka)(kb) + c(kb)^2[/tex]. Simplifying this expression, we obtain f(ka, kb) = [tex]k^2(ax^2 + bxy + cy^2) = k^2f(a, b),[/tex] which demonstrates the desired result.
ii) Using the result from part i), we can prove that if a is not congruent to 0 modulo p, then the equation f(x, y) ≡ a (mod p) always has a solution. Suppose f(x, y) ≡ a (mod p) has no solution for some value of a not congruent to 0 modulo p. Therefore, if a is not congruent to 0 modulo p, we can choose an appropriate value of k such that [tex]k^2f(a, b)[/tex] ≡ b (mod p), leading to a solution for f(x, y) ≡ b (mod p). Thus, if a is not congruent to 0 modulo p, f(x, y) ≡ a (mod p) always has a solution.
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True or false is the graph of y = 2/3 x + 4
Answer:
False. 2/3 is positive so therefore, it would be increasing, not decreasing.
Step-by-step explanation:
If the coefficient of determination is 0.422, what percentage of the variation in the data
about the regression line is unexplained?
2 pts
42.2%
17.8%
82.2%
57.8%
The percentage of the variation in the data about the regression line that is unexplained is 100% - 42.2% = 57.8%. So, the correct option is D, 57.8%.
If the coefficient of determination is 0.422, the percentage of the variation in the data about the regression line that is unexplained is 57.8%. Coefficient of determination, denoted by R² is a statistical tool that measures how well the regression line approximates the real data points. It is also called the square of the correlation coefficient between the dependent and independent variables.
The coefficient of determination varies from 0 to 1, and it represents the proportion of the total variation in the dependent variable that is explained by the variation in the independent variable. A coefficient of determination of 0.422 indicates that the regression line explains only 42.2% of the total variation in the dependent variable. Hence, the percentage of the variation in the data about the regression line that is unexplained is 100% - 42.2% = 57.8%.
Therefore, the correct option is D, 57.8%.
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If V is a finite-dimensional inner product space and V = WW2 is the direct sum of two subspaces, which of the following must be true? • If Ty : W1 + W1 and T2 : W2 + W2 are linear transformations, then there is a unique linear transformation T:V + V such that T(W1) =T1(wi) for all w1 € W1, and T (W2) = T2(W2) for all W2 E W2. • If {V1, ..., Un} is a basis for V such that {V1, ..., Uk} is a basis for W1, then {Uk+1,..., Un} is a basis for W2. • If projw, is the orthogonal projection map onto W1, then for all v EV, we have v-projw, (v) € W2.
The correct statement is:
• If projw₁ is the orthogonal projection map onto W₁, then for all v in V, we have v - projw₁(v) ∈ W₂.
What is finite-dimensional inner product space?
In a finite-dimensional inner product space V, if V = W₁ ⊕ W₂ is the direct sum of two subspaces W₁ and W₂, the orthogonal projection map projw1 onto W₁ is a linear transformation that projects any vector v onto the subspace W₁. The projection of v onto W₁ is the closest vector in W₁ to v.
The statement v - projw₁(v) ∈ W₂ means that the difference between v and its projection onto W₁ lies in the subspace W₂. This is true because V is the direct sum of W₁ and W₂, which means any vector in V can be uniquely decomposed as the sum of a vector in W₁ and a vector in W₂. Therefore, the difference v - projw₁(v) will be in W₂.
This property holds for any vector v in V, so the statement is true.
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Perform these steps: 1. State the hypotheses and identify the claim. 2. Find the critical value(s) 3. Compute the test value. 4. Make the decision. 5. Summarize the results. Use the traditional method of hypothesis testing unless otherwise specified. Assume all assumptions are met. 6. Game Attendance 10. Lottery Ticket Sales A lottery outlet owner hypothesizes that she sells 200 lottery tickets a day. She randomly sampled 40 days and found that on 15 days she sold fewer than 200 tickets. At a = 0.05, is there sufficient evidence to conclude that the median is below 200 tickets?
Hypotheses and Claim:Null Hypothesis (H0): The median number of lottery tickets sold per day is 200.Alternative Hypothesis (HA): The median number of lottery tickets sold per day is below 200.
Claim: There is sufficient evidence to conclude that the median is below 200 tickets.
Critical Value(s):
To determine the critical value for the hypothesis test, we need to specify the significance level (α). In this case, α is given as 0.05.
Since the sample size is relatively small (n = 40), we can use the t-distribution to find the critical value. The critical value corresponds to the lower tail because we are testing whether the median is below 200 tickets.
Using a t-table or a statistical software, we find the critical value tα/2 with (n - 1) degrees of freedom. For α = 0.05 and (n - 1) = 39, we find t0.025 = -1.685.
Compute the Test Value:
To compute the test value, we need to calculate the test statistic, which is the t-value.
Let's define X as the number of days the owner sold fewer than 200 tickets. In this case, X follows a binomial distribution with n = 40 and p = 0.5 (assuming equal probability of selling more or fewer than 200 tickets).
Since the sample size is large enough, we can approximate the binomial distribution using the normal distribution. The mean (μ) and standard deviation (σ) of the binomial distribution can be calculated as follows:
μ = np = 40 * 0.5 = 20
σ = sqrt(np(1-p)) = sqrt(40 * 0.5 * 0.5) = sqrt(10)
The test statistic t is given by:
t = (X - μ) / (σ / sqrt(n))
In this case, X = 15, μ = 20, σ = sqrt(10), and n = 40. Plugging these values into the formula:
t = (15 - 20) / (sqrt(10) / sqrt(40)) ≈ -2.24
Make the Decision:
In this step, we compare the test value to the critical value.
If the test value falls in the rejection region (t < tα/2), we reject the null hypothesis. Otherwise, if the test value does not fall in the rejection region, we fail to reject the null hypothesis.
In our case, the test value t = -2.24 is smaller than the critical value tα/2 = -1.685.
Therefore, we reject the null hypothesis.
Summarize the Results:
Based on the analysis, there is sufficient evidence to conclude, at the α = 0.05 level, that the median number of lottery tickets sold per day is below 200.
The lottery outlet owner's hypothesis that she sells 200 lottery tickets a day is not supported by the data, indicating that the median sales are lower than the claimed value.
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Which of the following transformations shifts all points graphed in the standard (wy)
coordinate plane down 5 coordinate units?
A. (X, y-5)
B. (X, y+5)
C. (X-5y)
D. (K-5, y)
E. (X+5,y)
Answer:
B is your answer
Step-by-step explanation:
Choose all of the points that are reflections of each other across both axes. (1.5,−2) ( 1 . 5 , - 2 ) and (−112,2) ( - 1 1 2 , 2 ) (4.5,−2) ( 4 . 5 , - 2 ) and (5.4,−2) ( 5 . 4 , - 2 ) (−112,3) ( - 1 1 2 , 3 ) and (−3,112) ( - 3 , 1 1 2 ) (1.75,−4) ( 1 . 75 , - 4 ) and (−134,4) ( - 1 3 4 , 4 )
Answer:
The points which are reflections across both axis are;
1) (1.5, -2) and [tex]\left (-1\dfrac{1}{2} , \ 2\right )[/tex]
2) (1.75, -4) and [tex]\left (-1\dfrac{3}{4} , \ 4\right )[/tex]
Step-by-step explanation:
The coordinate of the image of a point after a reflection across the 'x' and 'y' axis are given as follows;
[tex]\begin{array}{ccc}& Preimage&Image\\Reflection \ about \ the \ x-axis&(x, \ y)&(x, \, -y)\\Reflection \ about \ the \ y-axis&(x, \ y)&(-x, \, y)\end{array}[/tex]
Therefore, a reflection across both axis changes (only) the 'x' and 'y' value signs
The given points which are reflections across both axis are;
(1.5, -2) and [tex]\left (-1\dfrac{1}{2} , \ 2\right )[/tex]
We note that [tex]\left (-1\dfrac{1}{2} , \ 2\right )[/tex] = (-1.5, 2)
The reflection of (1.5, -2) across the x-axis gives the image (1.5, 2)
The reflection of the image (1.5, 2) across the y-axis gives the image (-1.5, 2)
Similarly, we have;
(1.75, -4) and [tex]\left (-1\dfrac{3}{4} , \ 4\right )[/tex]
We note that [tex]\left (-1\dfrac{3}{4} , \ 4\right )[/tex] = (-1.75, 4)
The reflection of (1.75, -4) across the x-axis gives the image (1.75, 4)
The reflection of the image (1.75, 4) across the y-axis gives the image (-1.75, 4).
The other points have changes in the values of the 'x' and 'y' between the given pair and are therefore not reflections across both axis
Tan(x)-sqrt (3)=0, I know that one of the solutions should be pi/3, but I don’t know how to get to that, does anyone know how to solve this?
16. You decide to drop a penny off the top of the Willis Tower (fromerly the Sears Tower) in Chicago, IL. The
height of the penny (in feet) can be represented by the equation h= -16t2 + 1451 where t is time (in seconds).
a) How long will it take for the penny to hit the ground? Show any work that leads to your answer.
Answer:
9.5 seconds.
Step-by-step explanation:
We know that the equation that represents the height of the penny as a function of time is:
h(t) = -16*t^2 + 1451
Where the height is in ft, and the time is in seconds.
a) We want to know how long takes the penny to hit the ground.
Well, the penny will hit the ground when its height is equal to zero.
Then we need to solve for t:
h(t) = 0 = -16*t^2 + 1451
0 = -16*t^2 + 1451
16*t^2 = 1451
t^2 = 1451/16 = 90.7
t = √90.7 = 9.5
This means that it takes 9.5 seconds to hit the ground.
Answer:9.5 seconds
Step-by-step explanation:you subtract
number 8 please help me
Answer:
15.9??
Step-by-step explanation:
a 90% confidence interval for the proportion of americans with cancer was found to be (0.185, 0.210). the margin of error for this confidence interval is:
The margin of error for the 90% confidence interval is 0.012.
Given, a 90% confidence interval for the proportion of Americans with cancer was found to be (0.185, 0.210)
To calculate the margin of error, we can use the following formula:
margin of error = (upper limit of the confidence interval - lower limit of the confidence interval) / 2
Substitute the given values,
margin of error = (0.210 - 0.185) / 2 = 0.0125 ≈ 0.012
Therefore, the margin of error for the confidence interval (0.185, 0.210) is 0.012.
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look at photo to answer!
please help
Answer:
the answer is minus 2 ( -2)
Answer:
B
Step-by-step explanation:
This involves reading the coordinates of points from the graph
When x = 3 then y = - 2 , that is the point (3, - 2 )
Does anyone know number 1 and 2 if so pls help!
Answer:
364×180=65,520 baskets
Step-by-step explanation:
since its a leap year(4days as shown in the document)
2nd question:
365×180=65,700 baskets
since its not a leap year
if u dont know leap years end with an even number which is 364 and non leap years end with odd number which is 365.
Find the slope of the line perpendicular to AB. A(3, 5) and B(3, -8).
Answer:
m = 0
Step-by-step explanation:
AB has a slope of y2 - y1 / x2 - x1 so -8-5/3-3 so -13/0 = undefined so it is a vertical line, so any line that is horizontal will be perpendicular to it, so horizontal lines have a zero slope
Please helppp What's the slope and y intercept of 3x - y = 7
Answer:
slope: 3
y intercept:(0,-7)
State the null hypothesis for a one-way ANOVA test if there are four groups.
In a one-way ANOVA test with four groups, the null hypothesis states that there is no significant difference between the means of all four groups.
This means that any observed differences in the sample means are due to chance or random integral alone and not because of any systematic or real differences between the groups.
The null hypothesis assumes that the population means for each group are equal, which implies that there is no effect or influence of the independent variable on the dependent variable. If the null hypothesis is accepted, it means that any observed differences between the groups are not statistically significant and do not support the alternative hypothesis.
To determine whether to accept or reject the null hypothesis, researchers calculate the F-statistic, which compares the variability between the sample means to the variability within each group. If the calculated F-value is greater than the critical F-value for a given level of significance, the null hypothesis is rejected in favor of the alternative hypothesis, indicating that there is a significant difference between at least two of the group means.
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[tex]2v^{2} +14=104[/tex]
Step-by-step explanation:
[tex]2 {v}^{2} + 14 = 104 \\ 2 {v}^{2} = 104 - 14 \\ 2 {v}^{2} = 90 \\ {v}^{2} = 90 \div 2 \\ {v}^{2} = 45 \\ v = \sqrt{45} [/tex]
I will leave the answer in square root form as i am not sure if you need to round your answer or not.
In this class we considered a variety of problems, formulas, and theorems. For an extra credit problem, describe a concept that we covered in class in your own words. It can be a theorem or a question that we solved in class or in homework problems (please don't repeat problems above). State the concept, explain the details in your own words.
The Pythagorean Theorem is a concept in geometry that explains the relationship between the sides of a right-angled triangle. According to this theorem, the square of the hypotenuse of a right-angled triangle is equal to the sum of the squares of its two legs. This can be represented in the form of an equation as c² = a² + b², where c is the hypotenuse and a and b are the legs of the triangle. This theorem is widely used in various fields, including architecture, engineering, and physics. It is named after the ancient Greek mathematician Pythagoras, who is credited with its discovery.
In simpler words, the Pythagorean theorem is used to find the length of the missing side of a right-angled triangle. For example, if we know the lengths of two sides of a triangle, we can use this theorem to find the length of the third side. This theorem is based on the fact that the hypotenuse is the longest side of a right-angled triangle, and that the square of a number is the product of that number multiplied by itself. It is also used to prove whether a triangle is a right-angled triangle or not. The Pythagorean Theorem is a fundamental concept in geometry and is an essential tool for solving various mathematical problems.
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A study reports the following data on impregnated compressive modulus (psi x 106) when two different polymers were used to repair cracks in failed concrete. Epoxy 1.74 2.15 2.02 1.95 MMA prepolymer 1.78 1.57 1.72 1.67 Obtain a 90% CI for the ratio of variances by first using the method suggested below to obtain a general confidence interval formula. (Use s₁ for expoxy and s₂ for MMA prepolymer. Round your answers to two decimal places.) 5₁²10₁² F₁
The 90% confidence interval for the ratio of variances is [0.05, 12.36].
Lets calculate the sample variances for each polymer.
For Epoxy:
Sample Variance (s₁²) = (1.74² + 2.15² + 2.02² + 1.95²) / (4 - 1)
= 0.135
For MMA Prepolymer:
Sample Variance (s₂²) = (1.78² + 1.57² + 1.72² + 1.67²) / (4 - 1)
=0.056
F statistic is F = (s₁²) / (s₂²)
F=0.135/0.056
=2.41
Determine the degrees of freedom for each sample.
For Epoxy: df₁ = 4 - 1 = 3
For MMA Prepolymer: df₂ = 4 - 1 = 3
Now find the critical F-value corresponding to a 90% confidence level with df₁ and df₂ degrees of freedom.
Using statistical tables or a calculator, the critical F-value for a 90% confidence level with df₁ = 3 and df₂ = 3 is approximately 5.14.
Calculate the lower and upper bounds of the confidence interval.
Lower Bound = (1 / F) × (s₁² / s₂²)
= (1 / 5.14) × (s₁² / s₂²)
= 0.050
Upper Bound = 5.14 × (s₁² / s₂²)
= F × (s₁² / s₂²)
=12.36
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Use the diagram to identify 4 collinear points
Answer:
the answer is the (L,N,K,O)
5/6 + 1/3 + 1/2 + 3/4 = ?
Answer:
23/12 or 1 11/12
Step-by-step explanation:
Answer:
29/12 or 2 5/12
Step-by-step explanation: