Identify the number of conditions in a factorial design on the basis of knowing the number of independent variables and the number of levels of each independent variable.

Review Questions

1. Why would a researcher have more than two levels of the independent variable in an experiment?

2. What is a factorial design? Why would a researcher use a factorial design?

3. What are main effects in a factorial design? What is an interaction?

5. Identify the number of conditions in a factorial design on the basis of knowing the number of independent variables and the number of levels of each independent variable.

6. Describe 2 × 2 factorial designs in which

(a) both independent variables are independent groups (between-subjects),

(b) both independent variables are repeated measures (within-subjects), and

(c) the design is mixed, so that one independent variable is independent groups and the other is repeated measures.