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The Physicians' Health Study randomly assigned 22,071 healthy male physicians at least 40 years old to...

The Physicians' Health Study randomly assigned 22,071 healthy male physicians at least 40 years old to take either an aspirin every other day or a placebo pill every other day. Of the 10957 physicians who took aspirin regularly for 5 years, 10 had a fatal heart attack and 128 had a nonfatal heart attack. Of the 11114 who took the placebo, 32 suffered a fatal heart attack and 221 had a nonfatal heart attack. Please use 4 decimal places to answer the questions below.

(a) What is the proportion of physicians who suffered a fatal heart attack in the:

aspirin group?   
placebo group?


(b) Calculate the relative risk of a fatal heart attack for physicians taking aspirin compared with those taking a placebo (do not use the rounded values from part (a) to do your calculations. Use the original proportions in your calculation. Remember, give your answer to 4 decimal places.).
  

(c) What is the proportion of physicians who suffered a nonfatal heart attack in the:

aspirin group?   
placebo group?


(d) Calculate the relative risk of a nonfatal heart attack, for physicians taking aspirin compared with those taking a placebo (do not use rounded values in your calculation and give your answer to 4 decimal places).

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