If researchers were evaluating the effectiveness of a mandatory arrest policy in decreasing incidents of intimate partner assault and an event such as the murder trial of O. J. Simpson occurred during the experiment, which of the following might also be said to have an effect on the subjects' outcome scores?

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Quizplus · Accepted Answer

External events (history effect) refer to events outside of the experiment that can influence the subjects' outcome scores. The O.J. Simpson trial is a significant external event that could potentially affect the subjects' attitudes or behaviors, and therefore should be taken into consideration when assessing the effectiveness of the mandatory arrest policy. The other options, exogenous change, the regression effect, and the John Henry effect, do not specifically apply to this situation.

If Researchers Were Evaluating the Effectiveness of a Mandatory Arrest