Ab-test-calculator

Statistical A/B test sample-size and significance calculator

Webfreeglobal

This is a free statistical calculator for A/B testing, computing required sample sizes and evaluating control-versus-variant conversion rates with a two-proportion z-test. It includes Bonferroni corrections for multi-arm tests and Newcombe confidence intervals, aimed at product managers, analysts and developers who want to avoid common testing pitfalls like peeking.

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