ANOVA With More Than One IV. 2-way ANOVA. So far, 1-Way ANOVA, but can have 2 or more IVs. IVs aka Factors . Example: Study aids for exam IV 1: workbook or not IV 2: 1 cup of coffee or not. Main Effects. Main Effects and Interactions.
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Both workbook and coffee
Interactions take many forms; all show lack of parallel lines.
Coffee has no effect without the workbook.
People with workbook do better without coffee; people without workbook do better with coffee.
Coffee always helps, but it helps more if you use workbook.
Both main effects and the interaction appear significant.
Two Factor, Between Subjects Design