QUESTION 11

Which of the following statements is true regarding the T Test for a mean:

The t test for a mean is a statistical test for a population mean. The t-test can be used when the population is normal, the population standard deviation is unknown and the sample size is less than 30

The t test for a mean is a statistical test for a population mean. The t-test can be used when the population is normal, the population standard deviation is known and the sample size is at least 30

The t test a statistical test for the variance or standard deviation. The t-test can be used when the population is normal, the population standard deviation is known and the sample size is at least 30

All of the above

None of the above

5 points

QUESTION 12

What is(are) the critical t test value(s) for a right tailed test where alpha is equal to .05 and the sample size (n) is equal to 23

-1.717

1.717

-2.101

-2.101 and 2.101

None of the above

5 points

QUESTION 13

State the Null and Alternate Hypothesis of the following claim: A ceral company advertises that the mean weight of the contents of its 20-ounce size cereal boxes is more than 20 ounces

Ho: U <= 20Ha: U > 20

Ho: U = 20Ha: U not equal to 20

Ho: U >= 20Ha: U

Ho: U = 4Ha: U is not equal to 4

Ho: U <= 4Ha: U > 4

5 points

QUESTION 14

Match the type of test that is associated with the stated claim

Ho: U = 82%

Ho: U > 2.5

Ho: U

One tailed, Left tailed test

One tailed, Right tailed test

Two Tailed Test

10 points

QUESTION 15

What is(are) the critical t test value(s) for a two tailed test where alpha is equal to .01 and the sample size (n) is equal to 27

-1.717

1.717

-2.101

-2.101 and 2.101

-2.779 and 2.779

a.

The t test for a mean is a statistical test for a population mean. The t-test can be used when the population is normal, the population standard deviation is unknown and the sample size is less than 30

b.

The t test for a mean is a statistical test for a population mean. The t-test can be used when the population is normal, the population standard deviation is known and the sample size is at least 30

c.

The t test a statistical test for the variance or standard deviation. The t-test can be used when the population is normal, the population standard deviation is known and the sample size is at least 30

d.

All of the above

e.

None of the above