Statistics calculators
Spread, z-scores, hypothesis screens, and random draws.
7 calculators
One-Way ANOVA (3 Groups) Calculator
Calculate sums of squares and the F statistic for three group means with equal sample sizes. Use the calculator above. Use the calculator above.
Poisson Distribution Calculator
Calculate exact and cumulative probabilities for counts from a Poisson process. Use the calculator above. Use the calculator above.
Random Number Generator
Generate a repeatable pseudo-random integer within a chosen inclusive range using a minimum, maximum, and changing roll value. Use the calculator above.
Sample Size Power Analysis Calculator
Estimate per-group sample size for a two-sided two-group comparison from effect, SD, alpha, and power. Use the calculator above. Use the calculator above.
Standard Deviation & Variance Calculator
Calculate the sample mean, sample variance, and sample standard deviation for up to six values. Use the calculator above. Use the calculator above.
Two-Sample t-Test Calculator
Calculate pooled two-sample t statistic and degrees of freedom from group summaries. Use the calculator above. Use the calculator above.
Z-Score & Normal Distribution Calculator
Standardize a value relative to a mean and standard deviation and estimate its cumulative normal probability. Use the calculator above.