An important aspect of a randomized, double-blind, placebo-controlled study is that subjects

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In a randomized, double-blind, placebo-controlled study, it is important that subjects are blinded as to whether they are in the treatment or placebo group. This helps eliminate bias from both the subjects and the investigators, as they will not know which group they are in and will therefore be less likely to alter their behavior or interpretation of the results. The other choices are incorrect as subjects do not receive both treatment and placebo, investigators do not assign subjects to treatment or control groups, and subjects should not be aware of whether they are receiving the treatment or placebo.

An Important Aspect of a Randomized, Double-Blind, Placebo-Controlled Study Is