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

The t-Test of Differences Between Means:
Independent Samples t-Test for Posttest Data

Step 11: Compare the calculated t-value with the critical t-value found in the table.

We now have a t-value of -2.02. Our next step is to compare this t-value with the value found in the table "Critical Values of the t-Distribution."