The STAT 20 Course Bundle — original practice exams & exam DNA
Data-driven, design-driven — not just math.
Study design, probability, inference, and regression — as one story.
Course Bundle — the full rehearsal system
Exam DNA, mock exams, sprint, protocol, and the recall deck — everything for this course in one checkout.
Exam DNA
The course's real question patterns, decoded.
Mock Exam
Real format, rubric-style solution key.
Sprint
Day-by-day plan keyed to the term calendar.
AI Protocol
Use AI tutors without trusting unverified answers.
Recall Deck
150 original cards · 8 topics · Anki-importable + printable.
Why this course hurts
STAT 20 doesn't lack effort. It lacks a system.
- Conceptual study-design questions punish formula memorizers.
- p-values, confidence intervals, and CLT conditions are easy to recite, hard to apply.
- R labs, problem sets, and exams compete for the same hours.
- The final mixes interpretation with computation — you need both fluencies.
What's in the Course Bundle
Five products. Each one earns points.
Exam DNA Report
The archetype map for Stat 20: study-design questions, inference-test selection, CI and p-value interpretation, and regression output reading.
Mock Exam Pack
Two original full-length mocks in the Stat 20 format — each worked answer includes the full interpretation sentence the grader wants.
14-Day Exam Sprint
A day-by-day plan: design lenses first, then inference decision trees, ending in timed mixed mocks.
AI Study Protocol
AI misstates CLT conditions: practice prompts, plus the conditions-check verification routine.
Recall Deck
150 cards: design checklists, test conditions, and interpretation templates. Anki-importable and printable.
The trap list
What actually sinks STAT 20 students
- 1
Correlation → causation slips on design questions.
- 2
Skipping the conditions check — then every inference answer breaks.
- 3
Reading a CI as “95% of the data is inside it.”
- 4
Interpreting regression output without checking the model's story.
Look inside
A spread from the Exam DNA
Every Exam DNA follows this layout: the recall schedule you'll run, the high-yield concepts explained as decision rules, the traps called out before they cost you points, and practice designed to be done from memory.
Page shown from the CS 61A Exam DNA — all twelve courses use the same format.
Get the 10-page sample free
Pair it with
The STAT 20 Recall Deck
- 150 original cards across 8 topic clusters — concepts, decision rules, and worked-question prompts.
- Anki-importable TXT/CSV files + a printable PDF version for paper reviewers.
- Built for spaced repetition — card order and tags follow the sprint's recall plan.
- 3-minute import guide included (Anki and Quizlet).
STAT 20 FAQ
Is this specific to how the course is actually taught?
The DNA report covers the course's stable core — the exam archetypes, the point economy, the decision rules. For professor-specific details it routes you to the course's own public materials (mapped in the Free Stack section of your DNA Report), and the Sprint adapts in minutes.
Which products do I actually need?
The DNA report tells you what the exam asks; the mock pack makes you rehearse it; the deck makes it permanent. Most students take the Course Bundle — all five products are $56 separately, and the bundle is $39 — the whole course for the price of the Mock Exam Pack plus $20.
How do I import the deck?
Any flashcard app that imports text (Anki, Quizlet). Each deck ships as Anki-importable TXT/CSV plus a printable PDF, with a 3-minute import guide included.
What if it doesn't help?
14-day refund, no questions asked. We'd rather refund you than keep a dollar that didn't earn itself.
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