When comparing two groups, a historical event can affect one group more than the other group, threatening the internal validity of the study.

Question

Quizplus · Accepted Answer

If a historical event has a differential impact on the two groups being compared, it can threaten the internal validity of the study by potentially confounding the results. This is because it introduces a potential alternative explanation for any observed differences between the two groups. Therefore, it is important to take into account any historical events that may have affected the groups being studied when interpreting the results of a comparison.

When Comparing Two Groups, a Historical Event Can Affect One