Statistics
Descriptive stats, distributions, regression and significance testing.
Descriptive statistics Paste data, get mean, median, mode, standard deviation, quartiles and a box plot. Normal distribution calculator Probabilities and z-scores with the area under the curve shaded as you type. Combinations & permutations nCr, nPr, factorials and the difference between them, in plain English. Linear regression Fit a line to pasted data: slope, intercept, R² and a scatter plot. A/B test significance Is that conversion-rate lift real? Two-proportion z-test with a plain-language verdict. Dice probability Exact odds for any number of dice, any number of sides, any target sum.