In an Experiment to Test the Effect of a New

question 65

Multiple Choice

In an experiment to test the effect of a new weight loss drug, half of the people in the study received the drug, and the other half received a placebo (a pill that has no physiological effect) . In addition, only males from the ages of 20 to 25 were selected to participate in the study. All participants received their treatments (drug or placebo) every day for 4 weeks. Which of the following components of the study design served as the control group?

• A) The 4-week length of the experiment.
• B) The restriction of study participants in age and gender.
• C) The participants who received a placebo.
• D) The participants who received the drug.

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