Question: . Before After Data A random sample of subjects is treated with a drug intended to lower their cholesterol levels. For each subject, the cholesterol

. Before After Data A random sample of subjects is treated with a drug intended to lower their cholesterol levels. For each subject, the cholesterol is measured once before the treatment and once after the treatment. Can we use the methods of this section to test the claim that the “before” cholesterol levels have a mean that is greater than the “after” levels? Why or why not?

Independent Samples and Matched Pairs. In Exercises 5–8, determine whether the samples are independent or consist of matched pairs.

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