When neither the subjects nor the experimenter are aware of which group is experimental and which is control, then the study is said to be
A) contaminated
B) confounded
C) concealed
D) double-blind

Question

Quizplus · Accepted Answer

When neither the subjects nor the experimenter are aware of which group is experimental and which is control, then the study is said to be double-blind. The purpose of a double-blind study is to minimize experimenter bias and placebo effects.

When Neither the Subjects nor the Experimenter Are Aware of Which