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Exam prep · AP Statistics

AP Statistics flashcards: conditions, formulas and the vocabulary of inference

AP Statistics is graded on how precisely you describe what the numbers mean. Flashcards are the right tool for the parts that have to be exact: the conditions for each test, the interpretation templates, and the formula sheet you need to read fluently. Start with the free decks below and build cards from your own notes.

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Updated 2026-10-27. Decks are shared by Quizcard and its users; study them on the page or copy them into a free account.

AP Statistics at a glance

Format: Section I: 40 multiple-choice questions in 90 minutes (50%). Section II: 6 free-response questions in 90 minutes (50%), including one investigative task.
Length: 3 hours.
Scoring: 1 to 5. No penalty for wrong answers, so answer every multiple-choice question.
Calculator: A graphing calculator is expected on both sections. A formula sheet and tables are provided.
Date: Early May, in the AP exam window. Register through your school.

What the AP Statistics tests

Unit 1: Exploring one-variable data. Displays, center and spread, normal distributions, z-scores. 15 to 23% of the exam.
Unit 2: Exploring two-variable data. Scatterplots, correlation, least-squares regression, residuals. 5 to 7%.
Unit 3: Collecting data. Sampling methods, bias, experiments versus observational studies. 12 to 15%.
Unit 4: Probability, random variables and probability distributions. Rules of probability, binomial and geometric distributions. 10 to 20%.
Unit 5: Sampling distributions. Central limit theorem, distributions of sample means and proportions. 7 to 12%.
Unit 6: Inference for categorical data: proportions. One- and two-proportion z-intervals and tests. 12 to 15%.
Unit 7: Inference for quantitative data: means. t-intervals and t-tests, paired data. 10 to 18%.
Unit 8: Inference for categorical data: chi-square. Goodness of fit, homogeneity, independence. 2 to 5%.
Unit 9: Inference for quantitative data: slopes. Confidence intervals and tests for a regression slope. 2 to 5%.

Free AP Statistics flashcard decks

Missing a topic? Upload the chapter from your prep book and Quizcard builds the deck for you, grouped by topic, with figures kept from PDFs. How it works.

Test yourself: free AP Statistics practice quizzes

AP Statistics: Probability, Random Variables and Sampling Distributions quiz14 multiple-choice questions with explanations · no account needed

Each quiz scores you at the end and explains every answer. Redo it any time; the questions reshuffle.

Sample cards from “Statistics 101: Core Concepts”

What does a 95% confidence interval mean?

Answer: If we repeated the sampling many times, about 95% of the intervals built this way would contain the true parameter.

Explanation

It does not mean there is a 95% chance the parameter is in this particular interval.

What are the three principles of experimental design?

Answer: Control, randomization, and replication.

Explanation

Blocking reduces variability from known nuisance variables.

Observational study vs experiment?

Answer: An observational study measures variables without intervening; an experiment assigns treatments.

Explanation

Only well-designed experiments can establish causation.

What is a lurking (confounding) variable?

Answer: A variable not included in the analysis that affects both variables being studied.

Explanation

Ice cream sales and drownings are both driven by hot weather.

What is a residual?

Answer: Observed y minus predicted y.

Explanation

Patterns in a residual plot suggest a linear model is not appropriate.

What does r² (coefficient of determination) tell you?

Answer: The proportion of the variation in y explained by the linear relationship with x.

Explanation

r² = 0.64 means 64% of the variation is explained.

Showing 6 of 30 cards. Study the whole deck or copy it into your account.

A flashcard study plan for the AP Statistics

Weeks 1 to 2: one card per vocabulary term in Units 1 to 3 (bias types, sampling designs, shape/center/spread language). Study the core concepts deck until the words are automatic.
Week 3: probability and distributions. Card the binomial and geometric conditions, the expected-value and variance rules, and when each applies.
Week 4: inference. Make one card per procedure with the conditions on the front and the test statistic, degrees of freedom and interpretation sentence on the back. Study the hypothesis-testing deck alongside it.
Week 5: upload your class notes or review book chapters and generate decks from them; do two released free-response questions a day and card every rubric point you missed.
Week 6: one full released exam under time. Keep only a “missed” deck for the last week and flip it daily.

How to write AP Statistics cards that work

Every inference card should carry the sentence template: “We are 95% confident that the interval from __ to __ captures the true __.” Graders look for the exact wording.
Card the conditions, not just the names: random, 10% condition, large counts (np ≥ 10 and n(1−p) ≥ 10), normal or n ≥ 30.
Put the formula-sheet symbol on the front and what it means in words on the back. You get the sheet in the exam; you have to read it fast.
For the investigative task, card the strategy: define the parameter, name the procedure, check conditions, compute, interpret in context.

Questions

Are the AP Statistics decks here free?

Yes. Every public deck can be studied on the page or copied into a free account, and making your own cards is free with no limits.

Can I make flashcards from my review book?

If you have it as a PDF, upload it and Quizcard builds a topic-grouped deck. Your first two generated documents are free; Plus ($6.99/month) covers fifteen a month.

Is there a practice quiz?

When a public deck has a quiz, it appears in the “Test yourself” section above. You can also press “Quiz me” on any deck you copy.

Do I need to memorise formulas?

No, the formula sheet is provided. You do need to know which formula applies and what each symbol means, which is what the cards here drill.

Other exams

Official information: College Board: AP Statistics. Formats and weights change; check the official page before test day.

Try it with your own material

Upload a PDF, slides or notes and study the deck in minutes. Making your own cards is free with no limits.

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