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The _____________________ is a statement of no change, no effect, or no difference.

________________________ is a procedure, based on sample evidence and probability, used to test statements regarding a characteristic of one or more populations.

If we reject the null hypothesis when the statement in the null hypothesis is true, we have made a Type ___ error.

The _______________________________ is the probability of making a Type I error.

If we do not reject the null hypothesis when the statement in the alternative hypothesis is true, we have made a Type ___ error.

The ____________________________ is a statement we are trying to find evidence to support.

A _____________ is a statement regarding a characteristic of one or more populations.

1. Explain the difference between a one-tailed test and a two-tailed test.
2. What are the formal steps involved in conducting a hypothesis test?
3. Draw a rejection region for each type of test.

a.

b.

c.

1. What is a -value used for, and how is it used?
2. Researchers must choose the level of significance based on the consequences of making a Type I error.
3. What happens to the probability of making a Type II error if you decrease the probability of making a Type I error?
4. In your opinion, is a Type I error or Type II error more serious?  Explain your answer.

7. The drug Lipitor is used to treat high cholesterol.  In a clinical trial of Lipitor, 47 of 863 subjects experienced headaches as a side effect.  The accompanying TI-83/84 Plus calculator display shows results from a test of the claim that fewer than 10% of treated subjects experience headaches as a side effect.

1. Is the test two-tailed, left-tailed, or right-tailed?
2. What is the null hypothesis?
3. What is the test statistic?
4. What is the -value?
5. What is the conclusion?

8. The drug Eliquis is used to help prevent blood clots in certain patients.  In clinical trials, among 5924 patients treated with Eliquis, 153 developed the adverse reaction of nausea.  Is there evidence to suggest that less than 3% of Eliquis users develop nausea.

9. In a survey of 3005 adults aged 57 through 85 years, it was found that 81.7% of them used at least one prescription medication.  Use

to test the claim that more than

of adults use at least one prescription medication.