3. [5 points] The Helsinki Heart Study asked whether the anticholesterol drug ge

Question

3. [5 points] The Helsinki Heart Study asked whether the anticholesterol drug gemfibront. reduces heart attacks. In planning such an experiment, the researchers mu that the The st be confident sample sizes are large enough to enable them to observe enough heart attacks sinki study planned to give gemfibrozil to about 2000 men aged 40 to 55 and a placebo to another 2000. The probability of a heart attack during the five-year period of the study for men this age is about 0.04. What are the expectation of the number of heart attacks that will be observed in one group if the treatment does not change this probability?

Explanation / Answer

Number of person in one group= n=2000

Probability of heart attack=p=0.04

Hence

Expectaction of number of heart attacks= np=

2000*0.04=80

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