A well-known study of 23,000 randomly selected male physicians was conducted to determine if taking aspirin daily reduces the chances of a heart attack. Half of the physicians were given a regular dose of aspirin while the other half was given placebos. Six years later, among those who took aspirin, 114 suffered heart attacks while among those who took placebos, 189 suffered heart attacks. Does it appear that the aspirin can reduce the number of heart attacks among the sample group that took aspirin? Use α = 0.05. 1How do we know that a normal approximation is acceptable?
2What are the hypotheses?
3What type of test should be performed?
4What is the test statistic?
5What is the conclusion?