PS295 Lecture Notes - Lecture 16: Factorial Experiment, Complement Factor B, Design Matrix
Document Summary
Experimental design: sources of variability, interpreting experimental data with two factors. Allow researchers to assess two sources of variability in participants" responses: treatment variance due to the iv (main effect, error variance. The effect of a single factor iv in a factorial design on its own. The number of possible main effects equals the number of factors in a study. Ex 3 x 3 x 4 factorial design has 3 possible main effects. Occurs when the effect of one factor differs across the levels of another factor. Ex a study with 2 factors: task difficulty (easy vs hard) and method (paper vs electronic) with performance as the dv (2 x 2 design) Numbers in the cells represent the means of that particular condition. The effect of x on y depends on z. Ex the effect of task difficulty on performance depends on the method that the task is administered.
