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# Notes9 - ANOVA With More Than One IV 2-way ANOVA So far...

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

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2 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 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) Single Main Effect for A 2.0 1.0 Factor A 20 16 12 8 4 0 Single Main Effect B=1 B=2 A 1 2 B 1 2 10 20 10 20 (Workbook only)
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Notes9 - ANOVA With More Than One IV 2-way ANOVA So far...

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