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What is a parametric test

A test used when the data is parametric (something which can be normally measured, usually normally distributed)


What is a non-parametric test

Used when data is non-parametric - cannot be assumed to be following a normal distribution


Example of parametric test

T-test. Pearsons product-moment coefficient


Example of non-parametric tests

Mann-Whitney U test - unpaired data
Wilcoxon signed-rank test - compares two sets of observations on a single sample
Chi-squared test - used to compare proportions or percentages
Spearman, Kendall rank - correlation