Testing for an Interaction in Two-Way ANOVA
This short video is for students learning to interpret Two-Way ANOVA tables. This should not be the first video you watch on the topic, but it will be helpful for those that have had at least an introduction to Two-Way ANOVA.
The first step is to test for an interaction effect. If one exists, you should not test for main effects. If the p-value for the interaction effect is small, we conclude there is an interaction, and then we have to run a multiple comparison procedure.