One Strategy for Dealing with Preexisting Differences Between Experimental and Control

Multiple Choice

One strategy for dealing with preexisting differences between experimental and control groups in the nonequivalent comparison group design is to match the participants.

A) this procedure is as effective as randomly assigning participants from the start
B) this procedure eliminates local history as a confounding factor
C) this procedure, however, may introduce a regression-artifact phenomenon whenextreme scores are frequently needed to match
D) this procedure, however, confounds the research even more than the preexisting differences