This document provides an overview of the chi-square test. It discusses how chi-square can be used to test goodness of fit and independence. For goodness of fit tests, expected frequencies are calculated based on the null hypothesis and compared to observed frequencies using a chi-square statistic. For independence tests, observed and expected frequencies are calculated for cross-tabulated categorical data and any differences are quantified with chi-square. The document provides examples of calculating chi-square statistics and interpreting results.