Statistics Calculators

An interactive simulator for Bayes' Theorem and diagnostic testing. Explore how prevalence, sensitivity, and specificity affect the meaning of a positive or negative test.

Compute individual and cumulative Binomial probabilities

Choose a population shape, pick a sample size, and watch the sampling distribution of the mean emerge. An interactive CLT simulation with standard error bands and a Cauchy counterexample.

Compute the confidence interval for one- and two-sample tests

Use an interactive simulation to create repeated confidence intervals and see how often they capture the true population mean.

Use to perform hypothesis testing

Explore hypothesis testing through separate modes for errors and power, observed test decisions, and repeated sampling.

An interactive simulator for the Law of Large Numbers. Visualize sample mean convergence across different distributions including Die Rolls, Coin Tosses, and Weighted events.

Compute Z-scores and probability for normal distributions.

Compute individual and cumulative Poisson probabilities

Visualize how individual data points influence a regression line. Master OLS concepts through interactive point-dragging and manual fit discovery.

Compute the sample size for point estimation and hypothesis testing

Compute statistics for one- and two-variable data