Pearson's chi-square test HL, QL, YH A chi square test that is applied to sets of categorical data to evaluate how likely it is that any observed difference between the sets arose by chance. It is suitable for unpaired data from large samples. It is also the most widely used of many chi-squared tests. Pearson's Chi square test Pearson's X^2 test https://en.wikipedia.org/wiki/Pearson%27s_chi-squared_test chi square test