Interactives
Some statistics ideas refuse to come through a static page. These are built to be dragged: each one turns the concept students find hardest into something you can feel respond. Free, no login, works on phones. Teachers are welcome to project or assign them.
Which statistical test should I use?Answer two or three questions about your data and design, and the right procedure falls out with the calculator to run it.Descriptive statistics calculatorPaste a column of numbers and get every summary statistic at once, with the boxplot and histogram drawn on a shared scale.Descriptive statistics sandboxDrag data points on a dotplot and watch the mean chase outliers while the median holds still. The boxplot, SD, and IQR update live.Sampling distribution and CLT visualizerPick a lumpy parent population, slide the sample size, draw thousands of samples, and watch the distribution of sample means turn normal and narrow by root n.Regression influential-point explorerDrag one high-leverage point and watch the least-squares line, r, and the residual plot swing. Influence, made physical.