Mann-Whitney 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 important because it allows us to compare groups without assuming normality or homogeneity of variance…
How to Use This Calculator
- Enter the values for Sample 1 and Sample 2.
- Enter the sample sizes for both groups.
- 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
Let’s consider three scenarios where the Mann-Whitney U test can be applied…
Data & Statistics
| Sample 1 | Sample 2 |
|---|---|
| 12 | 15 |
| 18 | 14 |
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 independence of observations and random sampling.