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Exam Overview
AP Statistics is a 3-hour exam divided into two sections. The MCQ section tests breadth of knowledge, while the FRQ section — especially the investigative task — tests your ability to think statistically and communicate clearly.
| Section | Format | Questions | Time | Weight |
|---|
| Section I | Multiple Choice | 40 questions | 90 min | 50% |
| Section II Part A | Short FRQ | 5 questions | 65 min | 37.5% |
| Section II Part B | Investigative Task | 1 question | 25 min | 12.5% |
2026 Exam Date: AP Statistics is scheduled for Wednesday, May 13, 2026 (morning). Graphing calculators are permitted throughout the entire exam.
Top 10 Highest-Yield Topics
AP Statistics covers four main conceptual categories: Exploring Data, Sampling & Experimentation, Anticipating Patterns (Probability), and Statistical Inference. Inference dominates the exam — typically 30–40% of all questions.
| Topic | Category | Exam Frequency |
|---|
| Significance tests for means & proportions | Inference | Very High |
| Confidence intervals | Inference | Very High |
| Chi-square tests (GOF, independence, homogeneity) | Inference | High |
| Linear regression (LSRL, residuals, inference for slope) | Exploring Data | High |
| Sampling distributions | Probability | High |
| Experimental design (control, random, replication) | Sampling | Medium-High |
| Normal distribution & z-scores | Probability | Medium-High |
| Conditional probability & independence | Probability | Medium |
| Binomial & geometric distributions | Probability | Medium |
| Describing distributions (shape, center, spread) | Exploring Data | Medium |
The five short FRQs each focus on a single statistical concept. You have about 13 minutes per question. Each is scored on a 0–4 rubric by AP readers who look for specific statistical justifications — not just correct numbers.
Key FRQ Writing Principles
- State, Check, Do, Conclude (SCDC): For every hypothesis test, state your hypotheses, check conditions, run the test, and state your conclusion in context.
- Always answer in context. Saying "we reject H₀" is not enough. You must say what this means for the situation described.
- Check conditions explicitly. For t-tests: random sample, normality (n ≥ 30 or check graph), independence. For proportions: random, np ≥ 10 and n(1–p) ≥ 10, independence.
- State confidence level in interpretation. "We are 95% confident that the true mean is between A and B" — the phrase "we are 95% confident" is required.
The Investigative Task
The investigative task is the single most complex problem on the exam. It's scored out of 4 points and tests your ability to connect multiple statistical concepts across a multi-part problem. Unlike the short FRQs, it often introduces a novel context or asks you to extend your reasoning beyond standard procedures.
Common investigative task themes: simulation-based inference, comparing multiple groups with inference, designing and analyzing a study, interpreting regression output in a new way, or combining probability with inference.
How to Approach It
- Read the entire problem before answering any part.
- Parts (a) through (c) or (d) build on each other — use your earlier work.
- Show your statistical reasoning even when the answer seems obvious.
- If asked to "explain," write 2–3 sentences connecting the statistical concept to the context.
Common Mistakes
Mistakes that frequently cost points:
- Saying "the probability that H₀ is true is 0.03" — a p-value is NOT the probability the null hypothesis is true
- Skipping condition checks for tests and intervals
- Using σ (population SD) when you have sample data — use s and t-procedures
- Saying a confidence interval "proves" or "shows" the true parameter — it only "estimates"
- Not naming the specific test you're using (e.g., "two-sample t-test for difference in means")
Study Tips
- Practice writing full solutions. AP readers award points for communication, not just calculations. Writing out SCDC for every practice test is essential.
- Learn your calculator's stat functions. Know how to run 1-PropZTest, 2-SampTTest, LinRegTTest, and χ²-Test from the STAT → TESTS menu. You must also know how to interpret the output.
- Review AP released FRQs. The College Board posts scoring guidelines that show exactly what language earns each point — study these carefully.
- Don't memorize formulas you don't understand. The AP Statistics formula sheet is provided on the exam. What's tested is knowing when and why to apply each formula.
Practice resource: Work through inference problems in our
AP Statistics chapter library, which covers hypothesis testing, confidence intervals, and regression inference with step-by-step worked examples.
Struggling with AP Statistics?
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