In the TADS experiment, described in the text, the researchers used a double-blind procedure, meaning that

A) both the experimenters and the participants knew what group of adolescents were getting which treatment.
B) only the participants themselves knew which treatment they were receiving.
C) only the parents of the adolescents involved in the study were aware of which treatment they were receiving.
D) neither the participants nor the experimenters knew who was getting medication and who was getting a placebo.
E) only the experimenters knew who was getting medication and who was getting a placebo.

Question

Audrey Watson · Accepted Answer

Final Answer : D, Explanation :  In a double-blind procedure, neither the participants nor the experimenters know who is receiving medication and who is receiving a placebo. This is done to eliminate bias and increase the validity of the results. In this study, both the medication and placebo were identical in appearance to further ensure that neither the participants nor the experimenters could determine who was receiving which treatment.

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