An experiment in which neither the subjects nor the experimenters know who is receiving a drug or a placebo is called a _____ experiment.
A)blind
B)random control
C)placebo-blind
D)double-blind

Question

Quizplus · Accepted Answer

A double-blind experiment is the only answer that accurately describes an experiment in which both the subjects and experimenters do not know who is receiving the drug or the placebo. A placebo-blind experiment does not exist, and a random control experiment does not specify anything about blinding. The term "blind" by itself could refer to single-blind experiments, where either the subjects or experimenters are unaware of who is receiving the treatment.

An Experiment in Which Neither the Subjects nor the Experimenters