Plan samples and experiments, estimate uncertainty and compare groups using statistical tests suited to the data.
Which calculator should I use?
Begin with sample size or experiment design when planning data collection. Use confidence intervals to estimate a quantity, means and proportions tests for a defined comparison, ANOVA for multiple groups, and chi-square for counts. Consider nonparametric tests when their data requirements fit better.
Available calculators
Confidence Interval and Margin of Error Calculator
Compute one or two group confidence intervals for means or proportions with a stated method.
Sample Size and Power Calculator
Plan precision or approximate two-group power for independent, equally sized groups.
Hypothesis Test Calculator for Means and Proportions
Test one or two means or proportions from summary data, with the design and tail specified.
Chi-Square Test Calculator
Pearson chi-square goodness-of-fit or contingency analysis with expected counts and cell contributions.
ANOVA and Multiple-Group Comparison Calculator
Compare independent group means with one-way or Welch ANOVA and optional Holm-adjusted pairwise comparisons.
Nonparametric Test Calculator
Rank and sign tests for paired, two independent, or several independent samples.
Experiment Design and Random Assignment Calculator
Create seeded allocation schedules and an auditable treatment-count table.