Welcome

This web app hosts a set of calculators designed for precise test analysis, sample sizing, and utility calculations. It provides a straightforward user interface and approach to understanding statistical significance, confidence intervals, and addressing sample ratio mismatches. Whether it is a T-Test or a Z-Test, a one-tailed or a two-tailed test, a non-inferiority or paired (pre-post) test, you can use this tool to understand the results of your experiment.In the Sample Sizing section, you can customize your pre-test analysis by adjusting power, confidence levels, managing multiple variations and test setups. The Utilities section provides tools for calculating standard deviation, checking normality of test data, and resolving sample ratio mismatches. For a deeper understanding of A/B testing theory, the resources section contains curated readings from authoritative sources.