A/B Test Significance (two-proportion z-test) — Conversion rates, lift, z-score, p-value and significance for two variants.
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Confidence Interval Calculator — Confidence interval for a population mean or proportion given sample statistics.
Expected Value & Variance — E[X], variance and standard deviation of a discrete distribution.
Normal Distribution Probability — CDF, survival, z-score, and percentile queries for any normal distribution.
Percentile Calculator — Value at a given percentile, or the percentile rank of a value, over a dataset.
Linear Regression (least squares) — Best-fit slope, intercept, r^2 and an optional prediction from paired x/y data.