Review AP Statistics with unit study guides, practice questions, and FRQ practice across all 9 units, from exploring data to confidence intervals and hypothesis tests. Use these AP Stats resources to practice data displays, probability, sampling, inference, calculator work, and written justifications for the exam.
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, often searched as AP Stats, teaches you to make sense of real-world data by exploring patterns, visualizing distributions, and describing relationships with clear graphs, summaries, and models. You learn to collect trustworthy data through sampling and experimental design, use probability and simulation to reason about randomness, and apply sampling distributions to understand how sample results vary.
From there, the course develops formal inference: confidence intervals and hypothesis tests for proportions, means, categorical data, and regression slopes. The emphasis is on more than running numbers. You verify conditions, choose the right procedure, interpret results in context, and justify your conclusions in writing. By the end, you can look at a dataset, describe what it shows, and defend a claim about a larger population using sound statistical reasoning.
Represent and compare one- and two-variable data using graphs and summary statistics
Build and interpret linear regression models, residuals, and correlation
Design studies with random sampling and experiments to support valid conclusions
Apply probability, random variables, binomial and geometric distributions, and simulation
Use sampling distributions and the Central Limit Theorem to model variation
Construct confidence intervals and run hypothesis tests for proportions, means, chi-square, and slopes
The AP Statistics exam is 3 hours long with two sections weighted equally. Here is how the multiple-choice and free-response parts break down.
| 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.
Treat AP Stats as a year-long build, not a last-week cram. Work the units in order so your data and probability foundations in Units 1-5 are solid before you reach the inference units. After each unit, review the key terms and practice interpreting graphs, calculator output, and probability results in context. The biggest score difference comes from writing, so practice full free-response answers with the four-step structure: state, plan, do, conclude. For inference, focus on knowing which procedure fits a situation and how to verify conditions. Mix in timed multiple-choice sets to build speed, and use unit guides to target weak spots instead of rereading everything.
Week 1: Review Units 1-2 graphs, summary statistics, regression, and residuals with practice questions
Week 2: Lock in Unit 3 sampling and experimental design, then practice the data-collection FRQ type
Week 3: Drill Units 4-5 probability, random variables, and sampling distributions including the Central Limit Theorem
Week 4: Practice Units 6-7 confidence intervals and tests for proportions and means with full written FRQs
Week 5: Cover Units 8-9 chi-square and slope inference, focusing on choosing the correct procedure
Week 6: Take a timed mixed multiple-choice set plus the investigative task and review every miss
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.