Chapter Introduction

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12

Between-Subjects, Two-Way Analysis of Variance

LEARNING OBJECTIVES

  • Describe what two-way ANOVA does.

  • Complete a between-subjects, two-way ANOVA.*

    *Note: Formulas for calculating sums of squares appear in an appendix at the end of the chapter.

  • Interpret a between-subjects, two-way ANOVA.

CHAPTER OVERVIEW

Chapter 11 introduced one-way ANOVA, a test that allows the examination of the impact of more than two levels of an explanatory variable at one time. Now, this chapter introduces two-way ANOVA, a technique that allows researchers to examine the impact of two explanatory variables at one time. Because each explanatory variable will have at least two levels, as shown in Table 12.1, a two-way ANOVA is used when at least four sample means are being compared.

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12.1 Introduction to Two-Way ANOVA

12.2 Calculating a Between-Subjects, Two-Way ANOVA

12.3 Interpreting a Between-Subjects, Two-Way ANOVA