# Comparing population with unknown deviation

##### Question 1 of 20
5.0 Points
When comparing two population means with an you use a t test and you of freedom.

##### 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 use a t test for two independent means.

##### Question 3 of 20
5.0 Points
The alternative hypothesis can be proven if the alternative hypothesis is rejected.

##### Question 4 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 50 and a population standard deviation 5 and a sample size of 100. Machine 2 has a sample mean of 52 and a population standard deviation of 6 with a sample size of 36. With an alpha of .10 can we claim that there is a difference between the output of the two machines. Which of the following statements are true?

##### Question 5 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 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.

##### 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?

##### 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?

##### 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?

##### Question 9 of 20
5.0 Points
The null hypothesis can be proven if it is not rejected.

##### Question 10 of 20
5.0 Points
Pretend you are asked to test the claim that the true mean weight of gold bars in the safe is less than 15 ounces. You will have a/an

##### Question 11 of 20
5.0 Points
Pretend you are asked to test the claim that the true mean weight of chocolate bars manufactured in a factory is more than 3 ounces. You will have a/an

##### Question 12 of 20
5.0 Points
Your population mean used to be 7.1. The population standard deviation is 1.5. The sample size is 81. The sample mean is 4.2. .05 is your level of significance. The null hypothesis is that the population mean is = to 7.1, use your sample data to test this claim. If you use this information, you will reject the null hypothesis that the population mean is = 7.1.

##### Question 13 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 24 and a population standard deviation 6 and a sample size of 12. Machine 2 has a sample mean of 18 and a population standard deviation of 6 with a sample size of 9. 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?

##### Question 14 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 33 and a sample standard deviation 6 and a sample size of 18. Machine 2 has a sample mean of 31 and a sample standard deviation of 6 with a sample size of 18. 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?

##### Question 15 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 2,000.21 and a sample standard deviation 6.1 and a sample size of 2. Machine 2 has a sample mean of 1,998.76 and a sample standard deviation of 6.2 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?

##### Question 16 of 20
5.0 Points
A hypothesis is always a claim about a population parameter.

##### Question 17 of 20
5.0 Points
Pretend you are asked to test the claim that the true mean size of each dump truck you fill is different from 2 tons. You will have a/an

##### Question 18 of 20
5.0 Points
Your population mean used to be 6.0. The population standard deviation is 9. The sample size is 9. The sample mean is 7.0. .05 is your level of significance. The null hypothesis is that the population mean is less than or equal to 6.0, use your sample data to test this claim. If you use this information, you will reject the null hypothesis that the population mean is less than or equal to 6.0.

##### Question 19 of 20
5.0 Points
You work at a hospital that has always had about 200 employees staffed at night. You think that the number of employees staffed at night has recently increased and would like to test this claim. If you run a hypothesis test, which of the following statements would fit your problem?

##### Question 20 of 20
5.0 Points
You are a manager at a firm and you believe your monthly costs have increased. The costs have always been \$9,000 but you now believe they are more and would like to test this claim. If you run a hypothesis test, which of the following statements would fit your problem?

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