Stat Trek

Teach yourself statistics

Stat Trek

Teach yourself statistics

Show navigation menu Search site

Stat Trek

Teach yourself statistics

Show navigation menu Search site

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.

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.

Random number generator

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.

Sample Size Calculator

Stat Toolbox

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

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