Sampling, seen
Draw samples from odd-shaped populations and watch their averages line up into a bell curve anyway.
Series · Plates I–III
Statistics, seen
Three ideas that most of statistics rests on, each as something to pull on rather than a formula to memorise: why averages behave, why base rates matter, and what a best-fit line is fitting.
A thousand people and a test
Why a positive result from a good test can still leave you probably fine: Bayes’ rule, counted out in people.
Least squares, by hand
Drag the points and watch the best-fit line chase them. Then try to guess a correlation by eye.