Parametric vs. Nonparametric Tests
| Comparison type | Parametric | Nonparametric |
| Comparison of 2 independent groups with continuous outcomes | t test | Wilcoxon–Mann– Whitney test |
| Comparison of more than 2 independent groups with continuous outcomes | ANOVA | Kruskal–Wallis test |
| Comparison of 2 paired samples with continuous outcomes | Paired t test | Wilcoxon signed-rank test |
| Single proportion | Binomial exact test | χ2 test |
ANOVA = analysis of variance; χ2 = Chi-square.