Factorial ANOVA

Question 1

For a factorial ANOVA we need:

Answer 1

2x Factors
2x Levels
1x DV

Question 2

Between groups factorial ANOVA

Answer 2

4 groups - each do only one level of one factor

• find marginal means for FACTOR 1 by looking at mean for group 1(factor 1 level 1) and group 2(factor 1 level 2)
• find marginal means for FACTOR 2 by looking at mean for other group 1(factor 2 level 1) and group 2 (factor2 level2)

Question 3

What is simple effects?

Answer 3

the difference between any 2 levels of one factor in one of the levels in the other factor

Question 4

Interaction is significant - what do we do?

Answer 4

bonferroni corrected post hoc tests

if main effects are significant in a 2x2 ANOVA there is no need for post hoc tests

Question 5

Define interaction

Answer 5

looks at differences between the groups means - we could look at this using a bar or line graph
there will be a different pattern in the data for level 1 compared to level 2 of factor 2 in level 1 and 2 in factor 1