Frequently Asked Questions
What does Mann-Whitney U test?
Whether two independent samples come from the same distribution (specifically: stochastic equality). Doesn't require normal data.
Mann-Whitney vs t-test?
Use Mann-Whitney when data isn't normal or n is small. The t-test assumes normality and is more powerful when that holds.
How are ties handled?
This calculator uses average ranks for ties (standard practice). A more advanced version applies a tie correction to the SD.
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Estimates for informational purposes only.
Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.