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

What Is Chi-square?

The chi-square statistic tells us if two nominal-level variables are independent. In plain English, that means it shows whether there is a relationship between the two variables (in our case marijuana and alcohol use and program participation) that could not have been caused by chance alone.