PSYC 2001 Lecture Notes - Lecture 9: Factorial Experiment, Repeated Measures Design, Experiment

• School: Carleton University
• Department: Psychology
• Course: PSYC 2001
• Professor: Deanna Whellan

Document Summary

One independent (manipulates with more than two (2) options) Designs with more than one independent variable (also called factor) Has two independent variables , each with two levels. Each variable could have an effect or not. Main effects ignore the other independent variable. However many independent variables there are in the design, that is the possible number of main effects. The effect of one variable changes due to the other variable. Parallel lines mean the pattern was the same for both levels of the. Each main effect may or may not happen. The interaction may or may not happen. Knowing one, tells you nothing about the other. When a study finds an interaction and main effects, the interaction is almost always more important. A 2x2 factorial design can yield one of eight . *number of main effects is always the number of independent variables. Used when/where random assignment cannot be done.