A two-factor ANOVA is conducted to evaluate the effectiveness of exposure therapy in treating civilians and combat veterans who have PTSD.Both groups of clients are randomly assigned to receive either exposure therapy or routine care.A significant interaction effect is found in the two-factor ANOVA.Which of the following interpretations is most appropriate in light of these results?
A)Exposure therapy is more effective than routine care.
B)Both routine care and exposure therapy are effective.
C)The comparative effectiveness of the two treatment conditions varies, depending upon whether the clients are civilians or combat veterans.
D)Routine care is more effective than exposure therapy.

Question

Quizplus · Accepted Answer

The significant interaction effect suggests that the comparative effectiveness of the two treatment conditions (exposure therapy vs. routine care) depends on whether the clients are civilians or combat veterans. This means that we cannot simply conclude that exposure therapy is more effective than routine care or vice versa without taking into account the client group being treated. Additionally, we cannot conclude that both treatments are equally effective because the interaction effect suggests that their effectiveness varies depending on the client group. Therefore, choice C is the most appropriate interpretation.

A Two-Factor ANOVA Is Conducted to Evaluate the Effectiveness of Exposure