`chi2_contingency()`, Ch.19 section 19.5 - `chisquare()`, Ch.19 section 19.3 - conditions, Ch.19 section 19.4 - Cramer's V, **Ch.19 section 19.6** - goodness-of-fit, **Ch.19 section 19.3** - standardized residuals, **Ch.19 section 19.8** - test of independence, **Ch.19 section 19.5** Chouldechova im