Mann-Whitney U Test Calculator
This calculator performs the Mann-Whitney U test (also called Wilcoxon rank-sum test), a non-parametric alternative to the independent samples t-test. Use this when your data doesn't meet the normality assumption.
When to Use
- Comparing two independent groups
- Data is ordinal or continuous but not normally distributed
- Sample sizes are small
- Outliers are present that would skew parametric tests
Advantages
- No assumption of normal distribution
- Robust to outliers
- Can be used with ordinal data
Null Hypothesis
H₀: The distributions of both groups are equal (or equivalently, the probability that a randomly chosen value from one group is greater than a randomly chosen value from the other group equals 0.5)
