Teach yourself statistics

Statistics and Probability

This website provides training and tools to help you solve statistics problems quickly, easily, and accurately - without having to ask anyone for help.

Online Tutorials

Learn at your own pace. Free online tutorials cover statistics, probability, regression, analysis of variance, survey sampling, and matrix algebra - all explained in plain English.

  • Advanced Placement (AP) Statistics . Full coverage of the AP Statistics curriculum.
  • Probability . Fundamentals of probability. Clear explanations with pages of solved problems.
  • Linear Regression . Regression analysis with one or more independent variables.
  • ANOVA . Analysis of variance made easy. How to collect, analyze, and interpret data.
  • Survey Sampling . How to conduct a statistical survey and analyze survey data.
  • Matrix Algebra . Easy-to-understand introduction to matrix algebra.

Practice and review questions reinforce key points. Online calculators take the drudgery out of computation. Perfect for self-study.

AP Statistics

Here is your blueprint for test success on the AP Statistics exam.

  • AP Tutorial : Study our free, AP statistics tutorial to improve your skills in all test areas.
  • Practice exam : Test your understanding of key topics, through sample problems with detailed solutions.

Be prepared. Get the score that you want on the AP Statistics test.

Random Number Generator

Produce a list of random numbers, based on your specifications.

  • Control list size (generate up to 10,000 random numbers).
  • Specify the range of values that appear in your list.
  • Permit or prevent duplicate entries.

Free and easy to use.

Sample Size Calculator

Create powerful, cost-effective survey sampling plans.

  • Find the optimum design (most precision, least cost).
  • See how sample size affects cost and precision.
  • Compare different survey sampling methods.
  • Assess statistical power and Type II errors.

Tailor your sampling plan to your research needs.

Stat Toolbox

Check out our statistical tables and online calculators - fast, accurate, and user-friendly.

Discrete probability distributions

  • Hypergeometric
  • Multinomial
  • Negative binomial
  • Poisson distribution

Continuous probability distributions

  • f-Distribution
  • Normal distribution
  • t-Distribution

Special-purpose calculators

  • Bayes Rule Calculator
  • Combination-Permutation
  • Event Counter
  • Factorial Calculator
  • Bartlett's Test Calculator
  • Statistics Calculator
  • Probability Calculator

Each calculator features clear instructions, answers to frequently-asked questions, and a one or more problems with solutions to illustrate calculator use.

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AP®︎/College Statistics

Unit 1: exploring categorical data, unit 2: exploring one-variable quantitative data: displaying and describing, unit 3: exploring one-variable quantitative data: summary statistics, unit 4: exploring one-variable quantitative data: percentiles, z-scores, and the normal distribution, unit 5: exploring two-variable quantitative data, unit 6: collecting data, unit 7: probability, unit 8: random variables and probability distributions, unit 9: sampling distributions, unit 10: inference for categorical data: proportions, unit 11: inference for quantitative data: means, unit 12: inference for categorical data: chi-square, unit 13: inference for quantitative data: slopes, unit 14: prepare for the 2022 ap®︎ statistics exam.


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  1. Stats Homework 6.2.6 through 6.2.9

  2. Stats 243 = HW 8.3.1 = Confidence Intervals = Compute Proportion From Sample In Excel

  3. Stats 243 = HW 6.2.12 = Normal Distribution Computation Excel NORM.DIST

  4. Stats 243 = HW 9.1.4 = Alternative Hypothesis Left, Right Or 2 Tailed Test

  5. Stats 243 = HW 8.3.4 = Confidence Intervals = Compute Proportion From Real Sample In Excel

  6. Stats 243 = HW 7.1.8 = Sampling Distribution Probability Sample Mean Less Than Single And n in Excel


  1. Statistics and Probability

    Free tutorials cover AP statistics, probability, survey sampling, regression, ANOVA, and matrix algebra. Written and video lessons. Online calculators.

  2. Statistics and Probability

    Learn statistics and probability—everything you'd want to know about descriptive and inferential statistics.

  3. Mathway

    Free math problem solver answers your statistics homework questions with step-by-step explanations.

  4. AP®︎ Statistics

    Learn a powerful collection of methods for working with data! AP®️ Statistics is all about collecting, displaying, summarizing, interpreting, and making inferences from data.

  5. AI Statistics Solver

    Calculate statistics for free with the first AI-powered stats solver. Compute p-values, calculate sample sizes, and get step-by-step statistics homework help in seconds.