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Does lovastatin (cholesterol-lowering drug) minimize the risk of heart attack? In Texas study, researchers gave lovastatin to 2,325 people and inactive substitute to 2,081 people (average age 58). After five years, 57 of lovastatin group had suffered heart attack, compared with 97 for the inactive pill.

a) Describe the appropriate hypotheses.

b) Make a test statistic and p-value. Interpret the results at _ = .01.

c) Is normality assured?

d) Is the difference large enough to be significant?

e) What else would medical researchers need to know before the prescribing this drug widely?

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