CONTENTS

Table of Contents
Introduction

1. Descriptive Statistics in Evaluation
2. Subgroup Analysis
3. Variable - Are They Related?
4. Correlation
5. The t-Test of Difference Between Means

Supplements
Resources
Glossary

Wading Through the Data Swamp:
Program Evaluation 201

Background

The participant and comparison groups filled out the GPRA Youth Survey at pre- and posttest.

In the preliminary evaluator's report, Jack's evaluator only highlighted the results for one t-test comparing participants' pre- and posttest means. He failed to include information about the comparison. No wonder Jack was so distraught when he wrote to me! He didn't even know what a t-test was.