Mann Whiteny U Test Calculator

Introduction & Importance

The Mann-Whitney U test, also known as the Wilcoxon rank-sum test, is a non-parametric test used to compare two independent samples. It’s widely used in various fields, including statistics, biology, and social sciences…

How to Use This Calculator

1. Select the sample sizes for both groups.
2. Enter the desired significance level.
3. Click ‘Calculate’.

Formula & Methodology

The Mann-Whitney U test is based on the rank sum of the two samples. The test statistic U is calculated as…

Real-World Examples

Data & Statistics

Comparison of Mann-Whitney U test with t-test

Sample Size	Mann-Whitney U	t-test
10	3.846	2.236
20	2.898	2.093

Expert Tips

• Always check the assumptions before using the Mann-Whitney U test.
• Consider using the Wilcoxon signed-rank test for paired samples.

Interactive FAQ

What are the assumptions of the Mann-Whitney U test?

The main assumptions are that the samples are independent, and the dependent variable is ordinal.

For more information, see the NIST guide on the Mann-Whitney U test.