PPT Slide
Design of Factorial Experiments
Example: 2x2 factorial experiment testing the effects of study method and
incentive level (reward for good performance) on recall of prose
Study Method Incentive Level
A1 = Read only B1 = Low incentive (20 cents)
A2 = Read plus underline B2 = High incentive (5 dollars)
Dependent variable: score on 20-item recall test
Design: randomly assign subjects to 4 equal groups that receive all possible
combinations of levels of the two independent variables, as follows