Statistics, hands on
Interactive tools for building intuition about probability and statistics.
t-Test Lab
Explore one-sample, independent, and paired t-tests through interactive visualization — adjust parameters and watch the t-distribution, p-value, and confidence interval update live.
Sampling Lab
Draw samples from any population and watch the Law of Large Numbers and the Central Limit Theorem emerge — running-mean convergence and the bell curve of sample means, live.
Linear Regression
Simple linear regression you can poke — drag points and watch the least-squares line, R², the confidence band, and the slope's p-value respond.
Hypothesis Testing
A one-sample z-test you can steer — watch the p-value, rejection region, and Type I/II errors move as you change the effect, sample size, and α.
Distribution Explorer
Eight distributions with live parameter controls — PDFs, CDFs, the formulas behind them, and the history of each.
Guided lessons: distributions
OpenStax-aligned, step-by-step walkthroughs of the common probability distributions.
START THE LESSONS →The Bayesian beta-binomial walkthrough — priors, likelihoods, and posterior updating — lives on the home page.
SEE BAYESIAN UPDATING →