Lectures 31 and 32: Main effects & Factorial Designs

What do parallel lines indicate? Non parallel lines?

Parallel: no interaction

Non parallel: interaction

What kind of ANOVA is used to analyze a simple design w/ 1 IV?

One way ANOVA

What kind of ANOVA is used to analyze a complex design with 2 IVs

Two way ANOVA

How many possible results are there in a 2 × 2 factorial design?

8 possible combinations of ME for IV 1 and IV 2 and their interactions (sig or not sig)

What is the difference between independent, repeated measures, and mixed factorial designs?

Independent: different samples (between subjects)

Repeated measures: same people in each group (within subjects)

Mixed: one IV is independent and other is repeated

When there are 2 IVs, what kind of test do you conduct and what do you compute?

2 way ANOVA, main effects of both IVs, and significance of interaction

How many interactions should be examined by a 3 independent variables ANOVA? (IV A, B, and C)

4 interactions:

• A x B

• A x C

• B x C

• A x B x C