The years of birth for the runners in the boston. Determine whether the study is
ID: 3208011 • Letter: T
Question
The years of birth for the runners in the boston. Determine whether the study is an observational study or an experiment. Explain. Researchers conduct a study to determine whether body mass index (BMI) influences the frequency of migraines. To conduct the study, researchers asked 162, 576 people for their BMIs and the numbers of migraines they have per month. (Source JAMA internal medicine) Researchers conduct a study to determine whether taking a multivitamin daily decreases the risk of major cardiovascular events among men. To perform the study, researchers studied 14, 641 men and had one group take a multivitamin daily and had another group take a placebo daily. (Source: The Journal of the American Medical Association)Explanation / Answer
a) This is an observational study because the researchers are only observaing BMIs and the number of migraines they have. There is no such experiment that is being carried out.
b) This is an experiment as the researchers are divinding the population in control and placebo groups and asking the control group take a multivitamin daily and placebo to take placebo daily. Since experiment is carried out this is an experimental study.
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