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# 9_ANOVA2 - ANOVA With More Than One IV 2-way ANOVA So far...

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ANOVA With More Than One IV

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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 Workbook (Factor A) Caffeine (Factor B) No Yes Yes Caffeine only Both No Neither (Control) Workbook only
Main Effects N=30 per cell Workbook (Factor A) Row Means Caffeine (Factor B) No Yes Yes Caff =80 SD=5 Both =85 SD=5 82.5 No Control =75 SD=5 Book =80 SD=5 77.5 Col Means 77.5 82.5 80 X X X X

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Main Effects and Interactions Main effects seen by row and column means; Slopes and breaks. Interactions seen by lack of parallel lines. Interactions are a main reason to use multiple IVs Workbook (Factor A) 86 84 82 80 78 76 74 Mean RM Test Score No Yes Without Caffeine With Caffeine Factor B
Single Main Effect for B 2.0 1.0 Factor A 25 20 15 10 5 0 Mean Response Single Main Effect B=1 B=2 A 1 2 B 1 2 10 10 20 20 (Coffee only)

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Single Main Effect for A 2.0 1.0 Factor A 20 16 12 8 4 0 Mean Response Single Main Effect B=1 B=2 A 1 2 B 1 2 10 20 10 20 (Workbook only)
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9_ANOVA2 - ANOVA With More Than One IV 2-way ANOVA So far...

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