Stats Without Walls free statistical tool for all levels

Start here.

1. Data: open a CSV from your computer, paste from a spreadsheet, or pick a sample dataset. Bin, stack, simulate random data, or draw a random sample.
2. Exploration: Descriptives, with the plots. Graph: bar, pie, histogram, dotplot, boxplot, stem and leaf, scatter, QQ, StatCrunch style, each with Group by.
3. T-Tests, ANOVA, Regression, Frequencies: the menus and options the course instructions use, so they work as written. Every result adds the formula, the decision, the sentence to write, and a condition check.
4. distrACTION: binomial, normal, t, chi-square and F, Poisson, geometric, hypergeometric, uniform, exponential and a custom discrete distribution (mean, SD and probabilities from x and P(x)), built in, nothing to install.
5. Learn: demonstrations you can run in class. Coin flips and the law of large numbers, the Central Limit Theorem, what a confidence interval means, what a p-value is, mean versus median, regression influence, guess the correlation, plus the sampling distribution simulator, bootstrap, permutation and Bayesian updating.

Means use t with degrees of freedom, because the population standard deviation is almost never given; when a problem does give it, use the Z-Test under T-Tests. Decisions use the p-value approach. Tests for a standard deviation are under Advanced. Your data stays on this computer, and the page keeps working with no internet once it has loaded. To install it like an app: in Chrome or Edge use the install icon in the address bar; in Safari on a Mac use File, then Add to Dock.