Medical researchers monitoring two groups of physicians over a 6-year period found that, of 3429 doctors who

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Medical researchers monitoring two groups of physicians over a 6-year period found that, of 3429 doctors who took aspirin daily, 148 died from a heart attack or stroke during this period. For 1710 doctors who received a placebo instead of aspirin, 79 deaths were recorded. At the 0.01 level of significance, does this study indicate that taking aspirin is effective in reducing the likelihood of a heart attack?

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