Non-parametric Tests

• NONPARAMETRIC STATISTICAL TESTS are used to test hypothesis about population parameters when the assumption about normality cannot be met.
• Sign Test- Non-parametric version of one-sample t test.
• Wilcoxon Rank Sum Test- Non-parametric equivalent to the independent t test.
• Wilcoxon Rank Sum Test- Also called the Mann-Whitney Test or Mann-Whitney U test.