AP Statistics review: exam format, the 5 units, and how to study

What’s on the AP Statistics exam

The AP Statistics exam splits evenly into two sections, as set out on the College Board’s AP Statistics exam page. Section I is 42 multiple-choice questions in 90 minutes, worth 50%, mixing stand-alone questions with question sets, often framed in real-life or workplace contexts. Section II is 4 free-response questions in 90 minutes, also 50%, and each one is a 10-point question worth 12.5% of your score: Question 1 centers on formulating questions and collecting data, Question 2 on analyzing data and interpreting results, Question 3 is an inference question (a hypothesis test or a confidence interval), and Question 4 pulls collecting, analyzing, and interpreting together. The investigative task from earlier exams is gone.

A graphing calculator is allowed on both sections, and you are given the official formula sheet and statistical tables, so the exam rewards choosing the right procedure and interpreting the result — not memorizing formulas. The whole thing runs 3 hours and, from May 2027, is fully digital: you answer both sections in the Bluebook app, typing your free-response work. Our AP Statistics formula sheet lays out exactly what you get.

The 5 units of AP Statistics

Since the course revision that took effect in fall 2026, AP Statistics is organized into five units in the Course and Exam Description. It opens with data and sampling, moves through probability, spends its middle on inference for proportions and for means, and closes with regression. Each percentage is that unit’s share of the multiple-choice section.

How AP Statistics is scored

Your multiple-choice and free-response points combine into one composite score, which the College Board scales to a 1–5 each year. AP Statistics is one of the more reliably passable AP exams — the pass rate has recently sat around 60% — but a strong free-response section, where you explain your reasoning in context, is what separates a 3 from a 5.

To see what a practice raw score becomes, run it through our AP Stats calculator.

How to study for AP Statistics

The single biggest lever is interpretation. Most lost points come from doing the right calculation but failing to state the conclusion in context, so practice writing full answers, not just numbers. Lean on the provided formula sheet and tables instead of memorizing.

Put steady reps into inference, since Units 3 and 4 are built on it and one of the four free-response questions is always an inference problem. Work past questions against the rubric with our AP Statistics FRQ guide, drill one unit at a time with the Progress Check walkthroughs, brush up definitions with our key concepts, and keep the cheat sheet handy for fast review.

When is the AP Statistics exam, and how long is it

AP Statistics is given once a year during the College Board’s May testing window, and the exam takes 3 hours. The exact date and start time are set each year, so confirm the current schedule on the official AP calendar with your coordinator before you plan around it.