1. Dataset A consists of the values {-7,2,23}. (a) What are the three deviations from the...
1. Dataset A consists of the values {-7,2,23}.
(a) What are the three deviations from the mean (with the correct signs) for the Dataset A observations?
(b) What are the three squared deviations for the Dataset A observations?
(c) What is the sample degrees of freedom for Dataset A?
(d) What is the sample variance for Dataset A?
Homework Answers
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1. Dataset A consists of the values {-7,2,23}.
(a) What are the three deviations from the...
5. Do you agree with the first three statements below? If yes, justify briefly. If not, correct it. For the last part, describe in a paragraph. If X is the mean of a random sample of size n froma pop...
5. Do you agree with the first three statements below? If yes, justify briefly. If not, correct it. For the last part, describe in a paragraph. If X is the mean of a random sample of size n froma population with the mean μ and the variance σ2, then its sampling distribution is a normal with the mean μ and the variance σ-, Agree Disagree If S2 is the variance of a random sample of size n taken from any...
What is the code and result in Rstudio or R 1. Suppose we have a random...
What is the code and result in Rstudio or R
1. Suppose we have a random sample 1.12, 0.44, -1.49, 0.02, 0.81, -1.34,1.34, 0.51,-0.12, 0.97. (a). Use two methods to find the sample mean (b). Use two methods to find the sample variance. (c). Find the sample standard deviation. 2. We can use function rt(n 100, df 2) to generate a random sample from a t-distribution with two degrees of freedom. The sample size is n 100. (a). Generate a...
4. Given the following dataset: 7, 4, 7, 9, 3 a. What is the mean? Show...
4. Given the following dataset: 7, 4, 7, 9, 3 a. What is the mean? Show your work. (1 point) 9+7+7+4+3 = 30 30/5 = 6 Thus, the mean is 6 b. What is the standard deviation? Use the table below to help. Round to 2 decimals. (2 points) X - M = Deviations (x-M) Squared Deviations (x-M)2 7 - 6 = 1 1 4 -6 = -2 4 7 -6 = 1 1 9 -6 = 3 9...
What is the total sum of squares? A. The sum of squared deviations from the mean...
What is the total sum of squares? A. The sum of squared deviations from the mean B. The sum of squared deviations from regression C. The effect of two or more variables on the independent variable
We have a dataset with n = 10 pairs of observations (li, yi), and X; =...
We have a dataset with n = 10 pairs of observations (li, yi), and X; = 683, Yi = 813, i=1 _ x* = 47,405, { x:9; = 56,089, {y} = 66,731. i=1 What is the mean squared error estimate for the variance of the residuals?
We have a dataset with n= 10 pairs of observations (Li, Yi), and n C;= 683,...
We have a dataset with n= 10 pairs of observations (Li, Yi), and n C;= 683, yi = 813, i=1 i=1 n n n { x = 47,405, 1:9= 56,089, y = 66,731. i=1 i=1 i=1 What is the mean squared error estimate for the variance of the residuals?
pls help, i don't understand what i did wrong Suppose the value of Young's modulus (GPa)...
pls help, i don't understand
what i did wrong
Suppose the value of Young's modulus (GPa) was determined for cast plates consisting of certain intermetallic substrates, resulting in the following sample observations: 116.4 115.6 114.6 115.1 115.5 (a) Calculate X. 115.4 GPa Calculate the deviations from the mean. (Enter your answers to two decimal places.) 115.6 116.4 114.6 115.1 115.5 deviation 1 0.04 -0.8 01 (b) Use the deviations calculated in part (a) to obtain the sample variance and the...
3. Suppose you are given a data sampe of three independent observations. The three values are...
3. Suppose you are given a data sampe of three independent observations. The three values are 13,5,4). For this question, show how you're doing the cakculations rather than use a computer. What is the sample mean? The sample median? The sample variance? (Check the book for the formula for the sample variance with estimated mean.)
31. Short Answer Question We have a dataset with n = 10 pairs of observations (li,...
31. Short Answer Question We have a dataset with n = 10 pairs of observations (li, yi), and 72 22 683, yi = 813, 1 11 72 n 2} = 47,405, «xy = 56,089, y = 66, 731. i=1 What is the mean squared error estimate for the variance of the residuals?
Both standard deviations are known and we determined α 2 = 0.05. Now the degrees of...
Both standard deviations are known and we determined
α
2
= 0.05. Now the degrees of freedom needs to be found to find the
corresponding t value from a table. The degrees of freedom
is calculated as follows where s1 is the sample
standard deviation for population 1, n1 is the
sample size from population 1, s2 is the sample
standard deviation for population 2, and n2 is
the sample size from population 2.
df =
s12
n1
+
s22...
5. Do you agree with the first three statements below? If yes, justify briefly. If not, correct it. For the last part, describe in a paragraph. If X is the mean of a random sample of size n froma population with the mean μ and the variance σ2, then its sampling distribution is a normal with the mean μ and the variance σ-, Agree Disagree If S2 is the variance of a random sample of size n taken from any...
What is the code and result in Rstudio or R
1. Suppose we have a random sample 1.12, 0.44, -1.49, 0.02, 0.81, -1.34,1.34, 0.51,-0.12, 0.97. (a). Use two methods to find the sample mean (b). Use two methods to find the sample variance. (c). Find the sample standard deviation. 2. We can use function rt(n 100, df 2) to generate a random sample from a t-distribution with two degrees of freedom. The sample size is n 100. (a). Generate a...
We have a dataset with n = 10 pairs of observations (li, yi), and X; = 683, Yi = 813, i=1 _ x* = 47,405, { x:9; = 56,089, {y} = 66,731. i=1 What is the mean squared error estimate for the variance of the residuals?
We have a dataset with n= 10 pairs of observations (Li, Yi), and n C;= 683, yi = 813, i=1 i=1 n n n { x = 47,405, 1:9= 56,089, y = 66,731. i=1 i=1 i=1 What is the mean squared error estimate for the variance of the residuals?
pls help, i don't understand
what i did wrong
Suppose the value of Young's modulus (GPa) was determined for cast plates consisting of certain intermetallic substrates, resulting in the following sample observations: 116.4 115.6 114.6 115.1 115.5 (a) Calculate X. 115.4 GPa Calculate the deviations from the mean. (Enter your answers to two decimal places.) 115.6 116.4 114.6 115.1 115.5 deviation 1 0.04 -0.8 01 (b) Use the deviations calculated in part (a) to obtain the sample variance and the...
3. Suppose you are given a data sampe of three independent observations. The three values are 13,5,4). For this question, show how you're doing the cakculations rather than use a computer. What is the sample mean? The sample median? The sample variance? (Check the book for the formula for the sample variance with estimated mean.)
31. Short Answer Question We have a dataset with n = 10 pairs of observations (li, yi), and 72 22 683, yi = 813, 1 11 72 n 2} = 47,405, «xy = 56,089, y = 66, 731. i=1 What is the mean squared error estimate for the variance of the residuals?
Both standard deviations are known and we determined
α
2
= 0.05. Now the degrees of freedom needs to be found to find the
corresponding t value from a table. The degrees of freedom
is calculated as follows where s1 is the sample
standard deviation for population 1, n1 is the
sample size from population 1, s2 is the sample
standard deviation for population 2, and n2 is
the sample size from population 2.
df =
s12
n1
+
s22...
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