# Survey research and design in psychology/Tutorials/ANOVA/Mixed-design ANOVA

From Wikiversity

## Mixed-design ANOVA

This dataset and exercise is from Francis (2007) (UC students can download a scanned section of the textbook). Mixed-design ANOVA is not covered in Allen and Bennett.

**Data file**: AQUES_MixedANOVA.sav**Design**: The design is a 2 (**birth order**) x (2) (**reaction time**) mixed ANOVA:- IV (between-subjects) = Birth order (1st/Subsequent)
- IV (within-subjects) = Hand (dominant/non-dominant)
- DV = Reaction time

**Research questions**:- Do reaction times different between first-born and subsequently born people (between-subjects main effect)?
- Do reaction times differ between the dominant and non-dominant hand (within-subjects main effect)?
- Is there an interaction between hand and whether people are first-born for reaction times?

**Descriptive statistics**:- Create a composite score of the within-subjects variable in order to be able to get the marginal total descriptives
- Via Analyse - Descriptives - Means

**Graphing**: Clustered bar chart, clustered error-bar chart, and line graphs could be useful, but only present one in a Results section.**Analysis**: Analyze - General Linear Model - Repeated measures - Specify the within-subject factor as Hand with 2 levels, then Define and add First-born as a between-subjects factor - Plots (optional) - Options (Descriptive statistics, Effect sizes, Power, Homogeneity tests)