Researchers want to investigate whether taking aspirin regularly reduces the risk of heart attack. Four hundred men between the ages of 50 and 84 are recruited as participants. The men are divided randomly into two groups: one group will take aspirin, and the other group will take a placebo. Each man takes one pill each day for three years, but he does not know whether he is taking aspirin or the placebo. At the end of the study, researchers count the number of men in each group who have had heart attacks. Match the most appropriate answer to each statement. \( \square \) This is a \( \qquad \) controlled experiment. \( \square \) The group of men who receive the asprin is called the \( \qquad \) group. The \( \qquad \) is the 400 men who participated. The \( \qquad \) is men aged 50 to 84 . 1. population 2. sample 3. placebo 4. controlled 5. blind 6. treatment
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First additional information: Controlled experiments are the backbone of scientific research! By randomly assigning participants to different groups, researchers can effectively isolate the effects of the treatment—in this case, aspirin—while minimizing the influence of outside factors. This helps ensure that any differences in outcomes, like the occurrence of heart attacks, can be attributed to the treatment rather than other variables. Second additional information: When participants are unaware of whether they’re receiving the treatment or a placebo, it adds an extra layer of reliability to the experiment! This "blind" design helps to prevent bias, ensuring that psychological factors don't influence how participants report their health. It keeps everyone honest and allows researchers to get a clearer picture of the real effects of aspirin on heart health.
