Which threat occurs in nonequivalent group designs because the groups may have different participant characteristics?
A)history effects
B)instrumentation effects
C)regression toward the mean
D)assignment bias

Question

Which threat occurs in nonequivalent group designs because the groups may have different participant characteristics?
A)​history effects
B)​instrumentation effects
C)regression toward the mean
D)​assignment bias

Quizplus · Accepted Answer

Assignment bias occurs in nonequivalent group designs because the groups may have different participant characteristics, which can affect the validity of the results. History effects refer to external events that occur during the study, instrumentation effects refer to changes in how the measurement is taken, and regression toward the mean refers to the tendency for extreme scores to become less extreme over time.

Which Threat Occurs in Nonequivalent Group Designs Because the Groups