Experiment: Male human control experiment

Now that you’ve warmed up,let’s try a trickier example:a study about the impact of aspirin on heart attack risk.The study randomly divides a pool of men into two groups.The members of one group take aspirin daily,while the others take a daily placebo.By the end of the trial,the control group suffered significantly more heart attacks than the group that took aspirin.Based on this situation, what’s wrong with the headline:Aspirin may reduce risk of heart attacks In this case, the study shows evidence that aspirin reduces heart attacks in men,because all the participants were men.But the conclusion “aspirin reduces risk of heart attacks” is too broad;