# Free Online Tutorials: Statistics and More

Stat Trek's free, online tutorials get you productive as quickly and painlessly as possible. Our tutorials cover:

Topics are introduced in short, easy-to-understand lessons; and on-line help is just a mouse click away.

Stat Trek's Advanced Placement (AP) Statistics tutorial has been carefully developed to help you master the Advanced Placement Statistics Examination. This tutorial provides accurate and complete coverage of the AP Statistics curriculum.

## Beyond AP Statistics

The Advanced Placement Statistics curriculum covers many importants topics in introductory statistics. But it leaves a few things out. This tutorial fills in some of the gaps.

## Simple Linear Regression

Simple linear regression is the most basic statistical technique for predictive analysis. It allows you to predict scores on one variable, based on scores on a second variable. This practical tutorial is packed with clear explanations and hands-on examples to guide you through the fundamentals of regression.

## Survey Sampling

Saavy statisticians use probability samples when they conduct survey research. This tutorial describes three probability methods for selecting and analyzing sample data - simple random sampling, stratified sampling, and cluster sampling.

## Matrix Algebra

This tutorial is an easy-to-understand introduction to matrix algebra, emphasizing matrix methods that are widely used in advanced statistics. After completing this tutorial, you will be familiar with matrix nomenclature, matrix notation, and common matrix operations.

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