10.44 - Does lovastatin (a cholesterol-lowering drug) reduce the risk of heart a

Question

10.44 - 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 iwth 97 for the inactive pill. a) state the appropriate hypthesis. b) obtain a test statistic and p-value.  Interpret the results a= .01. c) Is normality assured? d) Is the difference large enoughto be important? e) What else would medical researchers need to know before prescribing this drug widely?

Explanation / Answer

Here p1 = X1/n1 =57/2325 = 0.0245
p2 = X2/n2 = 97/2081 = 0.0466
a) Null Hypothesis: Both the proportions are equal
Alternative Hypothesis: lovastatin a cholestrol lowering drugreduce heart attacks
The test statistic is given by

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