AP Stat Inference

Suppose the P-value for a hypothesis test is 0.0304. Using a = 0.05, what is the appropriate conclusion?

• Reject the null hypothesis

• Reject the alternative hypothesis

• Fail to reject the null hypothesis

• Fail to reject the alternative hypothesis

When p-value is greater than alpha we:

• Reject Ho

• Fail to reject Ha

• Fail to reject Ho

• Reject Ha

H₀: μ = k

H₁: μ > k

• Left-tailed test

• Right-tailed test

A __________ occurs if you accept the null hypothesis when it is false.

• Type I error

• Type II error

A __________ occurs if you reject the null hypothesis when it is true.

• Type I error

• Type II error

A level of significance of 5% means:

• There's a 5% chance we're wrong

• There's a 5% chance we'll be wrong if we fail to reject the null hypothesis

• There's a 5% chance we'll be wrong if we reject the null hypothesis.

• There's a 5% chance you'll get an A on the test.

What percentage of students at a certain university live on campus?

• one-sample z test for a proportion

• one-sample z interval for a proportion

• two-sample z test for the difference of proportions

• two-sample z interval for the difference of proportions

Answer explanation

The question asks for the value of the proportion, so an interval is needed rather than a test. There is only one population: students at the university.

Is the average daily high temperature higher in June or July in a certain city?

• one-sample t test for a mean

• one-sample t interval for a mean

• two-sample t test for the difference of means

• two-sample t interval for the difference of means

Answer explanation

A yes/no question requires a test, not an interval. There are two separate populations: the days in the month of June and the days in the month of July.

Do the students at a certain university spend more than twenty hours per week on classwork, on average?

• one-sample t test for a mean

• one-sample t interval for a mean

• two-sample t test for the difference of means

• two-sample t interval for the difference of means

Answer explanation

This is a yes/no question that requires a test, not an interval. There is only one population: students at the university.

Hint: Create some numbers!

• A

• B

• D

• E