Question: For Exercises determine whether an observational study or an experimental study was used. Subjects are randomly assigned to three groups. Group 1 receives a placebo

For Exercises determine whether an observational study or an experimental study was used.

Subjects are randomly assigned to three groups. Group 1 receives a placebo daily, group 2 receives a high dose of vitamin B daily, and group 3 receives a multivitamin daily. After 3 months, each participant is asked how many incidents of depression that she or he had, and the occurrences were compared.

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