If this is your first visit to StatTrek.com, welcome. Our mission is to help you solve common statistics problems - quickly, easily, and cost-effectively.

## What We Do

We try to take the drudgery out of statistics by providing user-friendly instructional and analytical tools.

Stat Trek provides six free, online tutorials:

• Advanced Placement (AP) Statistics. The AP Statistics tutorial is designed to help students master the Advanced Placement Statistics Examination.
• Probability. The Probability tutorial covers probability theory in aw-shucks language. Clear explanations and pages of solved probability problems.
• Linear Regression. The Linear Regression tutorial is a pain-free introduction to regression. It explains how to predict scores on one variable, based on scores on one or more other variables.
• Analysis of Variance. The Analysis of Variance tutorial explains how to use analysis of variance to assess the effect of one or more independent variables on a dependent variable.
• Survey Sampling. The Survey Sampling tutorial describes three probability methods for selecting and analyzing sample data - simple random sampling, stratified sampling, and cluster sampling.
• Matrix Algebra. The Matrix Algebra tutorial is an easy-to-understand introduction to matrix algebra. It covers matrix nomenclature, matrix notation, and common matrix operations.

Topics are introduced in short, easy-to-understand lessons. Technical terms are linked to their definitions; so online help is just a mouse click away.

We offer a wide range of analytical tools to support topics covered in the tutorials. These tools include:

Each analytical tool features clear instructions, provides answers to frequently-asked questions, and includes sample problems with solutions.