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Statistics Essay

2018 words - 9 pages

Statistics
Name
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 N-2 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...

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