Which of the following statements is not true about randomized control trial?
A. Subjects are randomly assigned to an experimental group or a control group
B. The subjects do not know which treatment they are receiving
C. The main purpose of this research design is to observe variables in a population
D. The experimental group receives a treatment, while the control group receives a placebo
Ans: C. The main purpose of this research design is to observe variables in a population
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