A doctor suspects that the effectiveness of a new cholesterol medication depends on the age of the patient. If the doctor is correct, the results from a two-factor study comparing medication versus no-medication for young versus old patients should produce an interaction.

Question

Quizplus · Accepted Answer

The presence of an interaction in a two-factor study suggests that the effect of one factor depends on the level of the other factor. In this case, if the effectiveness of the cholesterol medication depends on the age of the patient, then there should be an interaction between medication and patient age. Therefore, the answer is A.

A Doctor Suspects That the Effectiveness of a New Cholesterol