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Introductory Statistics flashcards

3 decks · 209 cards · 23 with diagrams · built into Willys · free samples below

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Written against: Standard one-semester intro statistics course; OpenStax Introductory Statistics 2e, consulted as a reference; no text copied. Updated 2026-10-10.

What's in it

Every deck follows the course outline, with tags you can study or suspend topic by topic. Open a deck to study its free sample right here.

Learn · 2 decks · 154 cards

Concepts, mechanisms and the questions a course or exam asks about them.

Descriptive Statistics and Probability The first half of a college intro statistics course: data types and sampling, graphs, center and spread, z-scores, probability rules and conditional probability, binomial, Poisson and other discrete models, uniform and exponential models, and the normal distribution. 10 free · 80 cards in the app Inference and Regression The second half of a college intro statistics course: the central limit theorem, confidence intervals, one- and two-sample z and t tests, p-values and errors, chi-square tests, correlation and least-squares regression, and one-way ANOVA with the F distribution. 10 free · 74 cards in the app

Practice · 1 deck · 55 questions

Multiple-choice practice questions, one best answer each, with the reasoning.

Practice Questions Multiple-choice practice questions, one best answer each, on sampling and design, descriptive statistics, probability models, the normal curve, intervals, tests, chi-square, regression and ANOVA. 6 free · 55 questions in the app

23 cards carry a diagram drawn from the numbers on the card; the samples show some of them.

Study guide

Topics covered

The decks follow the order of the course outline. Numbers are cards per topic.

  • Sampling and Data 15
  • Descriptive Statistics 30
    • Graphs 9
    • Center and Spread 16
    • Position and z-Scores 5
  • Probability Topics 18
  • Discrete Random Variables 26
    • Expected Value 6
    • Binomial 10
    • Poisson and Other Models 10
  • Continuous Random Variables 8
  • The Normal Distribution 10
  • The Central Limit Theorem 11
  • Confidence Intervals 16
  • Hypothesis Testing with One Sample 22
    • Logic and Errors 14
    • z and t Tests 8
  • Hypothesis Testing with Two Samples 9
  • The Chi-Square Distribution 9
  • Linear Regression and Correlation 22
  • F Distribution and One-Way ANOVA 13

A study plan

  • 8 new cards a day covers everything in a month, leaving the last weeks for review.
  • 5 new cards a day covers everything in two months, leaving the last weeks for review.

Willys schedules reviews for you (FSRS spaced repetition), so the daily number above is only for new cards; reviews of what you have learned come back on their own. Study a topic's cards right after you meet it in class, suspend topics you have not reached yet, and use the app's quiz mode in the final two weeks.

How to get these decks

  1. Install Willys on your iPhone, iPad or Mac — App Store. 14-day free trial, then $14.99 a year.
  2. In Willys, tap Exam Library at the top of your Decks (or Browse Exam Library… under the + button), find the exam on its shelf or by search, tick it and tap Add.
  3. Study. The exam comes in as its own collapsible folder, every card scheduled by FSRS spaced repetition. Nothing you already have is changed.

Every deck is built into Willys

All 3 Introductory Statistics decks (209 cards), with FSRS spaced repetition, quizzes and mock tests, on iPhone, iPad and Mac. 14-day free trial, then $14.99 a year.

Get the app

In Willys, tap Exam Library at the top of your Decks (or Browse Exam Library… under the + button), find the exam on its shelf or by search, tick it and tap Add.

About these cards

Review status: Second-reader reviewed, with corrections applied.

Checked against:

  • OpenStax Introductory Statistics 2e, consulted as a reference; no text copied.
  • Diagrams are original, drawn for this deck by tools/diagrams/intro_statistics.py from the numbers on each card (SVG source and PNG in media/).
  • Every numerical answer, distractor and critical value was recomputed by script.
  • Original questions written for this deck with hypothetical data; no official, textbook or question-bank items were copied.

These are independent study notes written for Willys. They are not official exam material, may contain mistakes, and are no substitute for your course, your teacher or the exam owner's own publications. Found an error? Tell us — corrections ship as a new version of the deck.

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