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What should you interpret first in a factorial ANOVA?

Highest level interactions are interpreted first


What would you conclude if you observe an interaction effect in a factorial ANOVA?

If there is an interaction effect then one would conclude that there is a differential relationship among means and that you need to consider all elements within the interaction to interpret performance


If you have an interaction effect, what is less important and why?

Main effects: tend to be less important in the presence of interactions because of the need to discuss the differential effect within the interaction