In a meaningful double-blind study
A)neither the investigators assessing the drug's effects nor the participants know which drug the participants received
B)placebo drugs are never administered
C)expectancy effects are not a factor
D)only the investigators assessing the drug's effects know what drug the participants received

Question

Quizplus · Accepted Answer

In a double-blind study, both the investigators assessing the drug's effects and the participants receiving the drug or placebo are "blinded" or kept unaware of which treatment they received. This is done to minimize the impact of expectancy effects and to increase the rigor and reliability of the study results. Placebo drugs are often used in double-blind studies, but they are not the sole focus of blinding. Option B is therefore incorrect. Option D is also incorrect, as it is important that participants are blinded to the treatment they received to prevent expectancy effects from influencing their responses.

In a Meaningful Double-Blind Study