Statistical tests

Parametric assumptions

Normal distribution

samples randomly drawn

equal variance

data is interval or ratio

Repeated measures ANOVA

Difference between more than 2 related/dependent groups, interval/ratio data

ANOVA

Difference between more than 2 unrelated/independent groups, interval/ratio data

Friedman ANOVA by Ranks

Difference between more than 2 related/dependent groups, ordinal data

Kruksal-Walls ANOVA

Difference between more than 2 unrelated/independent groups, ordinal data

Paired t-test

parametric, Difference between 2 related/dependent groups, interval/ratio data

unpaired t-test

parametric, Difference between 2 unrelated/independent groups, interval/ratio data

Wilcoxon signed ranks

Difference between 2 related/dependent groups, ordinal data

Mann-Whitney U

Difference between 2 unrelated/independent groups, ordinal data

McNemar

Difference between 2 related/dependent groups, nominal data

Chi-Square

Difference between 2 unrelated/independent groups, nominal data

Pearson's product moment

Correlation between 2 groups, interval or ratio

Spearman's Rho/ Point biserial

Correlation between 2 groups, ordinal

Phi Coefficient

Correlation between 2 groups, Nominal