When is an experiment considered to be double-blind?
A) The hypothesis being tested is not based on previous observations.
B) It has already been performed by different researchers.
C) Neither the subjects nor the researchers know who is in the experimental and control groups.
D) The results of the experiment are only revealed to certain researchers.

Question

Quizplus · Accepted Answer

In a double-blind experiment, neither the subjects nor the researchers know who is in the experimental and control groups. This helps to eliminate bias and placebo effects.

When Is an Experiment Considered to Be Double-Blind