A mixed ANOVA approach is used to analyze a pretest-posttest design. The following is/are true:
A) A significant effect for the between-groups IV yields the most important information
B) A significant effect for the within-subjects IV yields the most important information
C) A significant interaction effect yields the most important information
D) None of the above

Question

Quizplus · Accepted Answer

A significant interaction effect is the most important because it indicates that the effect of the between-groups IV on the dependent variable differs depending on the level of the within-subjects IV. This provides valuable information about the effectiveness of the intervention being studied. A significant effect for the between-groups IV or within-subjects IV alone does not provide as much information.

A Mixed ANOVA Approach Is Used to Analyze a Pretest-Posttest