01
One-variable data
Shape, center, spread. Histograms, means, and standard deviations.
Statistics · grades 9–12 & AP
You don't read statistics.
You do it.
Fresh problems every time, graded the moment you answer, repeated until the idea is yours for good. A stats course you work through — not one you watch.
Free. Your teacher gives you a code — nothing to buy.
scatter · least-squares fitr = —
What's insidethe whole statistics course
Every part of the course — one problem at a time.
From describing a single distribution to running an inference test, with fresh, auto-generated versions so practice never becomes memorizing an answer key.
02
Two-variable data
Scatterplots, correlation, and the least-squares regression line.
03
Probability
Random variables, distributions, and the normal model.
04
Inference
Confidence intervals and significance tests — p-values and all.
Built by a stats teacher, in a real classroom.
Assign a set in a click. Run the period live. See — skill by skill — exactly what your students have mastered and what to reteach tomorrow.
- → Live class control: pace the room, share the board, build a class dotplot on the fly.
- → A mastery view of every student across every skill, at a glance.
- → Aligned to the current AP Statistics course.