Mann Whitney U Test Confidence Interval Calculator

Introduction & Importance

The Mann-Whitney U test is a non-parametric statistical test used to compare two independent samples. The confidence interval for this test provides a range within which the true population effect size is likely to fall. Understanding and using this calculator is crucial for making informed decisions based on your data.

How to Use This Calculator

1. Enter the sample size for both groups.
2. Set the significance level (α).
3. Enter the effect size (r).
4. Click ‘Calculate’.

Formula & Methodology

The formula for the Mann-Whitney U test confidence interval is complex and involves several steps, including calculating the z-score, the standard error, and the confidence interval itself.

Real-World Examples

Data & Statistics

Sample Sizes and Their Corresponding Critical Values

Sample Size (n)	Critical Value (U)

Effect Sizes and Their Corresponding r Values

Effect Size (d)	r Value

Expert Tips

• Always ensure your data meets the assumptions of the Mann-Whitney U test.
• Consider using a different test if your data is normally distributed.
• Interpret the confidence interval in the context of your research question.

Interactive FAQ

What is the Mann-Whitney U test?

The Mann-Whitney U test is a non-parametric statistical test used to compare two independent samples.

Learn more about the Mann-Whitney U test

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