Does lovastatin (a cholesterol-lowering drug) reduce the risk of heart attack? In a Texas study, researchers gave lovastatin to 2,081 people (average age 58). After 5 years, 57 of the lovastatin group had suffered a heart attack, compared with the 97 for the inactive pill.
(a) State the appropriate hypothesis
(b) Obtain a test statistic and p-value. Interpret the results at a= .01
(c) Is normality 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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