Research methods chapter 12

Interaction

Effect of one IV on the other IV

Factorial Design

2+ IV’s, IV’s are called factors, used to find an interaction

Allow us context in the influence of behavior

Identifying factorial designs in empirical articles

look for ANOVA, main effects or interaction

“it depends” “only when”

external validity

extent of the findings that can be generalized

The goal of most studies is to

test the hypothesis that came from a theory

If the lines are parallel that means theres

no interaction

main effect

overall finding, simple finding

Interaction

difference between differences

Independent groups factorial design

Multiple IV - different participants in each group

Within groups factorial design

participants experience all levels of the IV

Mixed factorial design

One IV measured as independent groups, one measured as within groups

More than 2 level IV’s

2 IV’s, 2+ levels

More than 2 IV’s

2 way interaction

3 way interaction

2 way main effect

Identifying factorial designs in empirical articles

look for ANOVA, interaction and main effect

language like “it depends” “Only when”