One idea per note, with a worked example and a question to try. Free, whether or not you take the course.
A truncated axis, a convenient window, two axes that cross on cue, circles sized by radius and totals with no denominator. How to spot each one, and the fix.
The median survives a bad outlier; the mean doesn't. Starting there makes everything after it easier.
Why a sample's variance divides by one less than the count, with a simulation you can run in a spreadsheet.
A test that's 95% accurate can still be wrong most of the time it says yes. Here's the table that shows why.
One lesson, three questions, five flashcards. A routine that fits a lunch break and still adds up by week 6.
Not the chance your idea is wrong, and not a measure of how big the effect is. Three readings to retire.
Median, box, whiskers, dots: the order to read them in and what each tells you.
Part of the Design Systems Library