Three weeks of practice before the exam. This one covers description, probability, the normal, sampling distributions and estimation — the material the exam's first three exercises draw on. The practice arena gives you endless fresh numbers; the exam cards give you every question type; the room gives you the worked answers and the traps.
When this week is written, each exercise below becomes a form on this page and a slide in the deck, generated from one array so the two can never disagree — and its solution opens when the instructor reveals it in class. Same engine as Weeks 1–2 (exercises.js).