PSYC 201 Chapter Notes - Chapter 11: Factorial Experiment

• School: University of Victoria
• Department: Psychology
• Course: PSYC 201
• Professor: Polson David

Document Summary

Want to examine effects of 2 or more variables in a single experiment . Factorial design involves all combinations of at least two values of 2 or more independent variables: have 2 variables, each has 2 values/levels 2 x 2 factorial design gives rise to 4 combinations. If 2 levels of one variable & 3 of another = 2 x 3 factorial experiment. Main effect the effect of one independent variable, averaged over all levels of another. Iv in factorial experiments: have 2 iv"s able to examine 2 possible main effects. Interactions when the effect of one independent variable depends on the level of another iv: use graphical presentation of data if graph of factorial experiment shows curve. & not parallel there is an interaction m. If lines are parallel no interaction between variables. Whenever there is an interaction in data main effect cannot be interpreted without discussing the interactions.