In Example 4.12 in your textbook, it describes the Physician's Health Study that concluded those taking aspirin had a significantly lower chance of suffering a heart attack than those who took a placebo. What other variables could have influenced this finding? Would an in-depth study of the subject's current health status make a difference in deciding whether or not one could conclude that aspirin alone could be effective in preventing heart attacks? Or can we believe the results of this study on face value?

Please answer should be Word Count: 300 not less than this

Reference: Mind on Statistics Edition 5 book