The six ideas students fight with all semester — as things you can poke. Each one runs in class on the projector and at home on your phone. Every sim ends with a "Try this" challenge; bring your answers to class.
Draw thousands of samples from lumpy, skewed populations and watch the distribution of means turn bell-shaped before your eyes. The Central Limit Theorem, live.
Open the CLT builder →Run YOUR study, then run ten thousand studies where nothing is going on. Your p-value is literally counted in front of you — and Type I errors happen on schedule.
Open the p-value machine →Two overlapping worlds, one critical line. Slide effect size, n, and α to see power move — and discover why n = 20 studies miss half of all real effects.
Open the power explorer →Click to place data points, drag them around, and watch r respond. Build an outlier that fakes a correlation; build a strong pattern r can't even see.
Open the playground →A hundred studies, a hundred intervals, one unmoving truth. See exactly what "95% confident" promises — and what it doesn't.
Open the CI dance →The living z table: slide a cutoff along the normal curve and read areas and percentiles. Then watch the t distribution's fat tails deflate as df grows.
Open the explorer →