In this volume, Larry Toothaker provides the procedures that will enable researchers to establish the significance of differences between two comparable groups. Issues addressed include: planned versus post-hoc comparisons; step-by-step versus simultaneous test procedures; types of error ra])G unequal sample sizes and variances; and interaction tests versus cell mean tests. Examples are used to illustrate major concepts.

Introduction

If you do research with more than two groups, you will want to compare these groups. Consider these examples: market research concerned with which of three types of television commercials is most effective, psychotherapy research concerned with comparing four different treatments for depression, and educational ...

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