A treatment causes subjects in the treatment group to score higher on a certain measure than the nontreatment group subjects. The researcher claims that the measure is a measure of IQ when, in fact, the measure really assesses mood. The researcher repeats the study numerous times, using a wide variety of subjects. The same pattern of results are obtained each time. This study has

Question

Quizplus · Accepted Answer

The study has poor construct validity because the measure used does not accurately assess what it claims to (IQ), but it has good internal validity because the treatment consistently causes a change in the measure across different subjects.

A Treatment Causes Subjects in the Treatment Group to Score