Psychology 2080A/B Chapter Notes - Chapter 12: Factorial Experiment

• School: Western University
• Department: Psychology
• Course: Psychology 2080A/B
• Professor: Gillian Mandich

Document Summary

Chapter 12: true experiments, part 2: factorial designs. Often we want to examine the effect of two or more variables in a single experiment because of : In the simplest case we have a 2 x 2 factorial. You can have as many levels but increasing complexity will require more time to conduct the experiment. Main effects main effect: in a factorial experiment the effect of one independent variable average over all levels of another independent variable interaction: when the effect of one independent variable depends on the level of another independent variable. If graphical representation of a factorial experiment shows curves aren t parallel there is an interaction between the variables. To have interaction if one or the other independent variable has no main effect or even if neither independent variable has a main effect.