The January cohort starts January 11. Enroll by January 4.See the schedule
A six-week course for people who use numbers at work and want to trust them. Short lessons, a worked example in every one, and a practice question before you move on.
Next cohort: January 11 to February 19, 2027. Prefer your own pace? Self-paced access starts the day you enroll.
Exercises use real public data from
A question, a definition, a worked example, one exam tip, then practice. After two lessons you know where to look, and review before a quiz takes minutes.
Definitions, worked examples, exam tips, common mistakes and things to remember always look the same, so skimming a lesson before a quiz takes a minute.
Each module ends with a deck. Flip, check, flip back.
See which days you studied and for how long. Missing a day costs nothing.
A ring per week shows what's done and what's next.
Real fractions and symbols, with every letter explained underneath.
Describe, picture, reason about chance, sample, estimate, then relate two variables. Each module ends with a ten-question quiz, so you know you have it before the next one starts.
We kept meeting smart people who froze at a p-value. Not because the math is hard, but because nobody had taught it in the order you need it. Ridgeway is that order: describe, picture, estimate, then test.
Every lesson ends with questions that explain the answer, right or wrong.
Exercises come in Google Sheets and Excel versions. Python is optional, never assumed.
Thursday office hours, and a cohort space where instructors answer within a day.
Answer one real question with your own data. An instructor reads it and writes back.
What changes is the schedule, the live sessions and who reads your capstone. One payment, no subscription.
All 34 lessons and quizzes, open for a year.
Six weeks with a group, a schedule and people to ask.
Five seats in a cohort for a team that learns together.
Not for you after the first week? Email us within 14 days for a full refund. No form, no questions.
No. You need arithmetic and patience. We use square roots and fractions, and every formula comes with a worked example and one plain sentence that says what it does.
A spreadsheet. Every exercise has a Google Sheets and an Excel version. Python notebooks are offered as an extra in weeks 4 to 6 and are never required.
Four to five hours: three to four lessons of 12 to 20 minutes, the practice questions, the module quiz, and the live session if you're in a cohort.
Lessons stay open for a year after your cohort ends, and every live session is recorded. Week 5 is lighter by design, so there is room to catch up.
Six Tuesdays of live sessions, office hours every Thursday, and feedback on a capstone built from your own data.
Enrollment closes January 4. Full refund within 14 days.
Part of the Design Systems Library