Purpose of a Control Group
In a clinical trial for a new drug, a control group is used to provide a baseline for comparison. Which of the following is the best example of a control group in this context?
A
A group that is recruited from a convenience sample without random assignment.
B
A group of participants chosen based on their strong motivation to participate.
C
A set of historical data used to compare with a current treatment group.
D
A group of participants receiving a placebo, serving as a benchmark to compare the treatment effect.
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