Endogenous Change Occurs When ______

Endogenous change occurs when ______.

A) the groups can differ over time because of differential attrition
B) natural developments in the subjects, independent of the experimental treatment, account for some or all of the observed change
C) subjects who are chosen for a study because of their extreme scores on the dependent variable become less extreme on the posttest due
D) something other than the treatment influences outcome scores

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