Experimental Design

The Good, The Bad, & The Ugly + + F =

The Good, The Bad, & The Ugly Primary 2 Secondary 2 Error 2 + + F =

The Good, The Bad, & The Ugly Error 2 Random, moves subjects apart within groups Secondary 2 Systematic, moves means apart Primary 2 Systematic, moves means apart + + F =

The Good, The Bad, & The Ugly Primary 2 Error 2 Secondary 2 + F = Eliminating Secondary Variances Eliminates Confounds; No Generalizability

The Good, The Bad, & The Ugly Primary 2 Error 2 Secondary 2 + F = Tight Experimental Control Reduces Error Variance, Increases Power

The Good, The Bad, & The Ugly Primary 2 Error 2 + F = + Counterbalancing Increases Generalizability but Reduces Power

The Good, The Bad, & The Ugly IV1: Primary 2 IV2: Primary 2 Error 2 + + F = Make Jessica an Independent Variable: Do a 2-way ANOVA Increases Generalizability & Power AND You get to look at Complex Relationships (Interactions)

The Good, The Bad, & The Ugly IV1: Primary 2 Error 2 + F =

The Good, The Bad, & The Ugly IV2: Primary 2 Error 2 + F =

The Good, The Bad, & The Ugly Interaction 2 Error 2 X + F =

The Good, The Bad, & The Ugly Interaction 2 Error 2 X + F =