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# Hypothesis Testing

Please see the attached file.

4.
(a) What is the meaning of the term "null hypothesis".

(b) How do you know when to perform a "left-tailed" test in a hypothesis-testing situation versus a "right-tailed" or "two-tailed" test?

5. A hypothesis test is used to test a claim. You get -1.47 as your test statistic and had -1.96 as your critical value in a left-tailed test. Which of the following is the correct decision statement for the test?

A. Reject the null hypothesis
B. Claim the null hypothesis is valid
C. Fail to reject the null hypothesis
D. Claim the alternative hypothesis is true

6. A hypothesis test is used to test a claim. You get a p-value of 0.03 on a test with a significance level of 0.05. Which of the following is the correct decision statement for the test?

A. Reject the null hypothesis
B. Claim the null hypothesis is valid
C. Fail to reject the null hypothesis
D. Claim the alternative hypothesis is true

7. Suppose a company that produces a weight loss product makes the claim that people who use its product as directed will lose more weight than people who use other weight loss products. In words, describe the Type I error you could make if you test this claim through a formal hypothesis test on collected data.

#### Solution Summary

The expert examines alternative hypothesis testing claims. The solution answers the question below.

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