Question: In a study examining the effectiveness of an education program, subjects are given a pretest. Their scores on the posttest increased because they learned information

In a study examining the effectiveness of an education program, subjects are given a pretest. Their scores on the posttest increased because they learned information in the pretest and not as a result of the education program. This is an issue of ______. A. testing B. regression C. external event D. maturation

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