Multiple Choice
A group of students is divided into two groups. One group is a given a new chewable vitamin and the other group is given a placebo. After six months they are asked to fill out a questionnaire and given a health exam to see whether the new vitamin has health benefits that are better than a placebo.
A) Controlled experiment
B) Observational study
Correct Answer:
Verified
Correct Answer:
Verified
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