Question: 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 heart attack, compared with 97 for the inactive pill.

1. State the appropriate hypotheses.
2. Obtain a test statistic and p -value. Interpret the results at α = .01.
3. Is normality assured?
4. Is the difference large enough to be important?
5. What else would medical researchers need to know before prescribing this drug widely?

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