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

Question

Quizplus · Accepted Answer

This is a controlled experiment because the researchers are actively assigning participants to either the treatment group (receiving the new vitamin) or the control group (receiving the placebo) to determine the effect of the vitamin.

A Group of Students Is Divided into Two Groups