Lamar recently participated in a social experiment examining the effects of crowds on self-esteem, but was unaware of which group he was assigned to. However, the social psychologists leading the study were aware of Lamar's group assignment. This is an example of:
A) a single-blind procedure.
B) a double-blind procedure.
C) a repeated measures design.
D) a planned contrast.

Question

Quizplus · Accepted Answer

In a single-blind procedure, the participants do not know which group they have been assigned to, but the researchers do. This is to prevent participant bias. Since Lamar didn't know his group assignment but the researchers did, it fits the definition of a single-blind procedure.

Lamar Recently Participated in a Social Experiment Examining the Effects