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:
Paired Sample t-Test for Participant Pre- and Posttests

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

We now have a t-value of 2.3. Our next step is to compare this t-value with the critical t-value found in the table Critical Values of the t-Distribution to see if it's statistically significant.