AP Statistics covers 9 units, from Exploring One–Variable Data to Slopes. Use this hub for unit study guides, topic review, practice questions, FRQs, key terms, cheatsheets, score calculators, practice exams, and exam prep.
AP Statistics teaches you to collect, explore, and reason about real-world data, then build formal inference like confidence intervals and hypothesis tests while clearly justifying every conclusion.
Get the big picture: what AP Statistics covers, how it is scored, and how the units connect.
read the overviewAnswer a quick mix of questions to see which units need the most review.
start a diagnosticOpen the unit you are studying now and review its guides, practice, and key terms.
browse all 9 unitsAP Statistics covers 9 units, from Exploring One–Variable Data to Slopes. Use this hub for unit study guides, topic review, practice questions, FRQs, key terms, cheatsheets, score calculators, practice exams, and exam prep.
Use this section breakdown to plan timed practice and decide which question types need review.
| Section | Questions | Time | % of Score |
|---|---|---|---|
| Section I – Multiple Choice | 40 | 90 min | 50% |
| Section II – Free Response | 6 | 90 min | 50% |
Total timed testing time: 180 minutes.
The course is organized into 9 units. The percentages below are the College Board exam weights, so you can see which units carry the most multiple-choice points. Open each unit for its study guide, topic pages, key terms, and practice questions.
AP Statistics Unit 1, Exploring One-Variable Data, teaches you how to describe a single variable using tables, graphs, and summary statistics, then how to put those descriptions into words that hold up in context.
AP Statistics Unit 2, Exploring Two-Variable Data, is about describing relationships between two variables, and its single biggest idea is the least-squares regression line, the line that lets you predict one quantitative variable from another.
How you gather data and what that lets you conclude.
AP Stats Unit 4 is where the course shifts from describing data to quantifying chance.
What happens when you take a statistic (like a sample mean or sample proportion) and ask how it would vary if you repeated your sample over and over.
AP Statistics Unit 6 is where you finally do inference, drawing conclusions about an entire population from one sample of categorical data.
AP Statistics Unit 7 covers statistical inference for means, which means using sample data to estimate or test claims about population averages.
AP Statistics Unit 8 covers chi-square tests, the inference procedures for categorical data with more than two categories.
AP Statistics Unit 9, Inference for Quantitative Data: Slopes, is the final inference unit of the course.
These trends come from real Fiveable practice data, so you can see what students are reviewing, which topics need extra attention, and how written practice can improve over time.
Miss rate is based on high-volume AP Statistics multiple-choice practice.
Average MCQ accuracy by student practice volume across 2,101 AP Statistics students.
Among AP Statistics FRQ responses that students retried on Fiveable, average scores rose from 41% on the first attempt to 72% on the latest attempt.
practice AP Statistics FRQs →These guides collect important exam skills, big ideas, essay tasks, and other subject-specific resources.
Skim the 9 unit pages, then choose the units that need the most review. Use topic guides for the concepts that feel fuzzy instead of rereading the whole course.
After each unit, answer practice questions and write free responses when they are part of the subject. Keep a short list of missed skills and revisit those guides before the next set.
Use exam guides, cheatsheets, score calculators, and practice exams when they are available for this course. The best final review plan connects content, question types, and timing.
Use the question types below to plan written-response practice and connect exam guides to timed FRQs. Open an example prompt to practice that question type right away.
| Question | Focus | Points | % of Score | Example prompt |
|---|---|---|---|---|
| FRQ 1 | Focus on Exploring Data | 4 | 8% | Yield distribution comparison across plant varieties |
| FRQ 2 | Focus on Sampling and Experimental Design | 4 | 8% | Sampling methods for estimating defective tiles |
| FRQ 3 | Focus on Probability and Sampling Distributions | 4 | 8% | Manufacturing quality control and tile defect classification |
| FRQ 4 | Focus on Inference | 4 | 8% | Daily tooth flossing habits among urban adults |
| FRQ 5 | Multi-Focus | 4 | 8% | Confidence interval interpretation for regression slope hypothesis test |
| FRQ 6 | Investigative Task | 4 | 13% | Bowley's Coefficient of Skewness for tomato varieties |
AP Statistics covers data analysis, sampling and experimental design, probability, random variables, inference, and statistical reasoning.
Use the unit guides to review each major concept, then work through AP-style practice to strengthen interpretation, setup, and calculator-supported reasoning.
Fiveable's AP Statistics FRQ practice includes AP-style free-response questions with AI-supported scoring so you can practice showing work, explaining conditions, and interpreting results.
Start with the units where you lose points most often, especially inference or probability. For exam review, focus on describing the setup clearly before worrying about every calculation detail.