trial designed to test the effectiveness of aspirin in preventing heart disease, 11,037 male physicians were treated with aspirin and 11,034 male physicians were given placebos. Among the subjects in the aspirin treatment group, 139 experienced myocardial infarctions (heart attacks). Among the subjects given placebos, 239 experienced myocardial infarctions. Use a 0.05 significance level to test the claim that aspirin has no effect on myocardial infarctions.   a. Test the claim using a hypothesis test. b. Test the claim using an appropriate confidence interval.

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