Chapter 14

What is a two-way ANOVA? What does it mean to say “between groups” ANOVA, “within groups” ANOVA, and “mixed-design” ANOVA?

Be able to differentiate using a two-way ANOVA from a oneway ANOVA. Be able to differentiate between and within groups for any factor. Be able to give/recognize examples of all of these combinations.

When and why do we use a two-way ANOVA?

What are the null hypotheses in a two-way ANOVA?

What are main effects? What means do we use to describe the main effect?

What is an interaction? What means do we use to describe the interaction?

How do we know when we have significant main effects and/or interaction? Why do we have to analyze each one (main effects and interaction) separately?

Be able to read/interpret a graph of an interaction.

Be able to read SPSS ANOVA output tables and understand/interpret the results.

What is “effect size”? What does this term tell us?  What are the guidelines for small, medium, and large effect size?

Define/briefly describe ANCOVA, MANOVA, and MANCOVA.

Be able to perform and interpret any SPSS procedures that we do for this chapter.