Question: In Exercises 2128, determine whether the study is an experiment or an observational study, and then identify a major problem with the study. When designing

In Exercises 21–28, determine whether the study is an experiment or an observational study, and then identify a major problem with the study.

When designing the study of a new treatment for insomnia in adults, researchers were criticized because their test subjects consisted of 75 college students. They then expanded the study so that 750 college students were given the treatment.

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