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.
