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Hypothesis Testing

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Does lovastatin (a cholesterol lowering drug) reduce the risk of heart attack? In a Texas study, researchers gave lovastatin to 2,325 people and an inactive substitute to 2,081 people (average age 58). After 5 years, 57 of the lovastatin group had suffered a heat attack, compared with 97 for the inactive pill. (a) State the appropriate hypotheses. (b) Obtain a test statistic and p-value. Interpret the results at a = .01. (c) Is nomality assured? (d) Is the difference large enough to be important? (e) What else would medical researchers need to know before prescribing this drug widely?

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