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study was recently conducted on a large number of subjects to determine the effectiveness of aspirin...

    1. study was recently conducted on a large number of subjects to determine the effectiveness of aspirin for reducing the risk of a heart attack. The subjects were divided into two treatment groups: 11,037 subjects were asked to take a regular dose of aspirin and 11,032 subjects were given a placebo to take instead of aspirin. At the end of the study, 104 of the subjects who took aspirin had a heart attack and 190 of the subjects who took the placebo had a heart attack.
  2. Prepare a contingency table to summarize the results of this study.

Treatment

Heart Attack

No Heart Attack

Total

Aspirin

Placebo

Total
  1. Use the table from question (a) to find the proportion of subjects in each treatment group that had a heart attack and the proportion that didn’t have a heart attack.
  2. What conclusions can we make about the effectiveness of aspirin for reducing the risk of having a heart attack?
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