AP Statistics · Exam Format
AP Statistics Exam Format & Section Breakdown
A complete walk-through of the AP Statistics exam, drawn from the College Board AP Course and Exam Description: total timing, per-section breakdown, official unit weightings, and the FRQ types you will see on test day.
Section breakdown and timing
| Section | Items | Time | Weight |
|---|---|---|---|
| Section I — Multiple Choice | 40 questions | 90 minutes | 50% of score |
| Section II — Free Response | 6 questions (5 short, 1 investigative task) | 90 minutes | 50% of score |
Total exam length: 3 hours.
The AP Statistics exam runs 3 hours end to end and is split into the following sections:
- Section I — Multiple Choice — 40 questions, 90 minutes, 50% of score.
- Section II — Free Response — 6 questions (5 short, 1 investigative task), 90 minutes, 50% of score.
The College Board publishes the full Course and Exam Description (CED) for AP Statistics on AP Central, including the official unit weightings reproduced below, sample multiple-choice items, and at least one full set of released free-response questions with scoring guidelines. ExamEdge US treats that CED as the source of truth for what is testable; every unit guide on this site corresponds to a unit in the official framework, and every FRQ walkthrough on this site mirrors the structure of a real released question.
Understanding the section breakdown is itself a score-lift technique. Many students who report "I knew the content but ran out of time" did not budget per-question time before walking in. Use the per-question time implied by the table above as a hard pacing limit during practice — for example, if Section II of AP Statistics gives you 90 minutes for 6 free-response questions, your average is 15 minutes per FRQ, and any FRQ that you have not at least sketched in 15 minutes should be skipped to the next so that you maximize point capture across all six.
The unit weightings below indicate the percentage of multiple-choice questions drawn from each unit in a typical release. Two practical implications: first, no unit is small enough to skip — even a 5–7% unit will contribute a measurable number of multiple-choice points. Second, the highest-weight unit on the exam deserves at least one full study session per week from week 2 onward, because a 17–20% unit will materially move your final score in either direction.
For each section above, the College Board publishes targeted skills (in AP Biology these are called Science Practices; in AP US History they are Historical Reasoning Skills; in AP Chemistry they are Science Practices). The skills do not change between exam years, so a student who masters the skill list will be able to answer next year's questions even though the specific stimuli will differ.
Official unit weightings
The percentages below come from the College Board AP Course and Exam Description for AP Statistics. They indicate the share of multiple-choice questions drawn from each unit on a typical exam release.
| Unit | Exam weight |
|---|---|
| Unit 1: Exploring One-Variable Data | 15–23% |
| Unit 2: Exploring Two-Variable Data | 5–7% |
| Unit 3: Collecting Data | 12–15% |
| Unit 4: Probability and Random Variables | 10–20% |
| Unit 5: Sampling Distributions | 7–12% |
| Unit 6: Inference for Proportions | 12–15% |
| Unit 7: Inference for Means | 10–18% |
| Unit 8: Inference for Categorical Data: Chi-Square | 2–5% |
| Unit 9: Inference for Quantitative Data: Slopes | 2–5% |
Free-response question types
Every AP Statistics FRQ falls into one of the published types below. ExamEdge US has a full annotated walkthrough for each one — open any link to see a representative prompt, the College Board-style scoring rubric, a sample student response, and grader commentary on where the points are typically won and lost.
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FRQ 1: FRQ 1 — Exploratory Data Analysis
FRQ 1 — Exploratory Data Analysis — Annotated walkthrough of an AP Statistics FRQ 1 — Exploratory Data Analysis free-response question, with prompt, scoring rubric, sample student response, and grader commentary.
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FRQ 2: FRQ 2 — Probability and Random Variables
FRQ 2 — Probability and Random Variables — Annotated walkthrough of an AP Statistics FRQ 2 — Probability and Random Variables free-response question, with prompt, scoring rubric, sample student response, and grader commentary.
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FRQ 3: FRQ 3 — Collecting Data / Experimental Design
FRQ 3 — Collecting Data / Experimental Design — Annotated walkthrough of an AP Statistics FRQ 3 — Collecting Data / Experimental Design free-response question, with prompt, scoring rubric, sample student response, and grader commentary.
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FRQ 4: FRQ 4 — Inference (Test of Significance)
FRQ 4 — Inference (Test of Significance) — Annotated walkthrough of an AP Statistics FRQ 4 — Inference (Test of Significance) free-response question, with prompt, scoring rubric, sample student response, and grader commentary.
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FRQ 5: FRQ 5 — Inference (Confidence Interval)
FRQ 5 — Inference (Confidence Interval) — Annotated walkthrough of an AP Statistics FRQ 5 — Inference (Confidence Interval) free-response question, with prompt, scoring rubric, sample student response, and grader commentary.
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FRQ 6: FRQ 6 — Investigative Task (Multi-Part Synthesis)
FRQ 6 — Investigative Task (Multi-Part Synthesis) — Annotated walkthrough of an AP Statistics FRQ 6 — Investigative Task (Multi-Part Synthesis) free-response question, with prompt, scoring rubric, sample student response, and grader commentary.