Mann-Whitney U Test Graphing Calculator
Introduction & Importance
The Mann-Whitney U Test, also known as the Wilcoxon rank-sum test, is a statistical test used to compare two independent samples. It’s particularly useful when the data is not normally distributed. This calculator provides an interactive way to perform the Mann-Whitney U Test and visualizes the results.
How to Use This Calculator
- Enter the sample sizes for both groups.
- Click ‘Calculate’.
- View the results and interpretation below.
Formula & Methodology
The Mann-Whitney U Test is based on the sum of ranks (U) of one sample. The formula for U is…
Real-World Examples
Example 1: Comparing two groups of students’ scores
Group 1: 85, 88, 90, 92, 95
Group 2: 80, 82, 84, 86, 88
Data & Statistics
| Test | Assumptions | Robustness to Violations |
|---|---|---|
| Mann-Whitney U Test | Independence, ordinal data | More robust to violations |
| t-test | Independence, normality | Less robust to violations |
Expert Tips
- Always check the assumptions before choosing a test.
- Consider using a non-parametric test like Mann-Whitney U when data is not normally distributed.
Interactive FAQ
What are the assumptions of the Mann-Whitney U Test?
The test assumes that the two samples are independent and that the data is ordinal.