Chapter 9

Choosing the right research design

One-Way Designs

• One independent variable• Two groups at a minimum• One-way, multiple-groups design

Factorial Designs

• Ins and outs of factorial designs• Main effects• Interactions

Within-Subjects Designs

• Between-subjects versus within-subjects• “Repeated measures” design• Advantages of within-subjects designs• Disadvantages of within-subjects

designs• Solutions to problems of within-subjects

designs

Mixed-Model Designs

• At least one independent variable is manipulated between-subjects

• At least one independent variable is manipulated within-subjects

Key Terms from Chapter 9• One-way design• Two-groups design• One-way, multiple-

groups design• Levels of an

independent variable• Factorial design• Main effect• Interaction

• Ordinal (spreading) interaction

• Disordinal (crossover) interaction

• Simple effects test• Between-subjects

design• Within-subjects design• Repeated measures

Key Terms from Chapter 9• Sequence effects• Carryover effects• Order effects• Practice effects• Interference

effects• Counterbalancing• Reverse

counterbalancing

• Partial counterbalancing

• Latin square design

• Structured debriefing

• Mixed-model designs