In a crossover effect, regression to the mean is an unlikely alternative hypothesis because
A) regression to the mean does not operate in quasi-experimental designs.
B) participants are not selected on the basis of extreme scores in nonequivalent control-group designs.
C) a crossover effect occurs prior to any statistical analyses.
D) the experimental group increased, not only to the mean of the control group, but changed beyond it.
Answer: D
Political Science
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