After reading this chapter, you should be able to:

1 Delineate the factorial design from the factorial experimental design.

2 Identify the appropriate sampling method for a factorial design used in an experiment.

3 Identify and describe three types of factorial designs.

4 Distinguish between a main effect and an interaction.

5 Identify main effects and interactions in a summary table and in a graph.

6 Identify the implications of using a quasi-independent factor in a factorial design.

7 Explain how a factorial design can be used to build on previous research, control for threats to validity, and enhance the informativeness of interpretation.

8 Describe the higher-order factorial design.

9 Compute a factorial analysis of variance for the between-subjects, within-subjects, and mixed factorial design using SPSS.