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Q1) Does lovastatin (a cholesterol-lowering drug) decrease 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 5 years, 57 of lovastatin group had suffered a heart attack, compared with 97 for the inactive pill.

a) Mention the suitable hypotheses.

b) Get a test statistic and p-value. Interpret results at α = .01.

c) Is normality assured?

d) Is the dissimilarity large enough to be significant?

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

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