The subjects in the experimental group receive the experimental drug, while the subjects in the control group receive a placebo. Although the experimenter knows which subjects are in the experimental group and which are in the control group, the subjects themselves do not know who is in which group or who received the real drug and who the placebo. This experimenter is using
A)a double-blind study to control for researcher bias.
B)a single-blind study to control for research participant bias.
C)random selection to control the extraneous variables.
D)random assignment to control the dependent variables.

Question

Quizplus · Accepted Answer

This is a single-blind study because the subjects do not know whether they are receiving the experimental treatment or a placebo, which controls for participant bias. However, the experimenter does know who is in each group, so it is not double-blind.

The Subjects in the Experimental Group Receive the Experimental Drug