Statistics
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Institution
Question 1 of 20  5.0 Points 
When comparing two population means with an unknown standard deviation you use a t test and you use N2 degrees of freedom.
A. True 
B. False 

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Question 2 of 20  5.0 Points 
Pretend you want to determine whether the mean weekly sales of soup are the same when the soup is the featured item and when it is a normal item on the menu. When it is the featured item the sample mean is 66 and the population standard deviation is 3 with a sample size of 23. When it is a normal item the sample mean is 53 with a population standard deviation of 4 and a sample size of 7. Given this information we could ...view middle of the document...
Machine 1 has a sample mean of 50 and a population standard deviation 5 and a sample size of 25. Machine 2 has a sample mean of 52 and a population standard deviation of 6 with a sample size of 12. We have an alpha of .01. Which of the following statements is true.
A. We can use 2.58 and 2.58 (or 2.57 and 2.57) as our critical values  
B. We will use a Z test  
C. We use 1.28 and 1.28 (or 1.27 and 1.27) as our critical values  
D. A and B are correct  
E. None of the above are correct  
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Question 6 of 20  5.0 Points 
You want to determine if your widgets from machine 1 are the same as machine 2. Machine 1 has a sample mean of 500 and a population standard deviation 6 and a sample size of 18. Machine 2 has a sample mean of 500.5 and a population standard deviation of 2 with a sample size of 2. With an alpha of .05 can we claim that there is a difference between the output of the two machines. Which of the following statements are true?
A. We will reject the null hypothesis and prove there is a difference between the 2 populations  
B. We will not reject the null hypothesis and thus we can’t prove there is difference between the 2 populations  
C. The critical values you will use are 1.96 and 1.96  
D. B and C are correct  
E. None of the above are correct  
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Question 7 of 20  5.0 Points 
You want to determine if your widgets from machine 1 are the same as machine 2. Machine 1 has a sample mean of 5 and a population standard deviation 2 and a sample size of 4. Machine 2 has a sample mean of 10 and a population standard deviation of 2 with a sample size of 64. With an alpha of .01 can we claim that there is a difference between the output of the two machines. Which of the following statements are true?
A. We will reject the null hypothesis and prove there is a difference between the 2 populations  
B. We will not reject the null hypothesis and thus we can’t prove there is difference between the 2 populations  
C. The critical values you will use are 1.96 and 1.96  
D. A and C are correct  
E. B and C are correct  
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Question 8 of 20  5.0 Points 
You want to determine if your widgets from machine 1 are the same as machine 2. Machine 1 has a sample mean of 15.1 and a population standard deviation 5 and a sample size of 12.5. Machine 2 has a sample mean of 14.9 and a population standard deviation of 6 with a sample size of 12. With an alpha of .01 can we claim that there is a difference between the output of the two machines. Which of the following statements are true?
A. We will not reject the null hypothesis  
B. The resulting test statistic will be less than 1  
C. The critical values you will use are 1.96 and 1.96  
D. A and B are correct  
E. A, B, and C are correct  
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Question 9 of 20  5.0 Points 
The null...