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Unformatted text preview: 1 Two-Way ANOVA Thus far, ANOVA with 1 IV Can have 2 or more IVs Example: IV1= workbook for study IV2 = caffeine (1 cup java 30 min before exam) DV = test score on exam. An IV is called a factor in ANOVA. Our design would look like this: Workbook (Factor A) Caffeine (Factor B) No Yes Yes Caffeine Only Both No Neither (Control) Workbook Only Gather data for N=30 per cell, analyze for mean differences using analysis of variance. We might find that the use of the workbook has an effect on test performance. This would be called a main effect for workbook (or more generally, a main effect for A). We might also find that caffeine has an effect on test performance. This would be called a main effect for caffeine (or more generally, a main effect for B). It might also happen that the influence of the workbook on test performance varies depending on whether a person has caffeine (suppose, for example that the workbook only helps for people who drink coffee). In such a case, there would be an interaction between workbook and caffeine (an A by B interaction)....
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This note was uploaded on 05/21/2011 for the course PSY 3213 taught by Professor Staff during the Fall '08 term at University of South Florida - Tampa.
- Fall '08