Congratulations! You are about to embark on an exciting adventure into the world of statistics. Perhaps, for you, this is unexplored territory. Even so, you probably have some ideas (and possibly some misconceptions) about what a course in statistics might be like. Sometimes students enter the course a bit apprehensive due to a perception of themselves as having poor math skills. If you have similar concerns, you can take comfort in knowing that most of the mathematical computations involved in statistics are not difficult. Although some of the formulas that you will use look rather ominous, their computation is simply a matter of breaking them down. Essentially, you need to know how to add, subtract, multiply, divide, work with signed numbers, find square roots (with a calculator), and know the order of mathematical operations. If you can carry out these functions, then you can rest assured that you have the prerequisite math ability to complete this book successfully. If you have not had a math course in a while and are feeling a bit rusty, there is a review at the end of this chapter that outlines some of the rules of computation. This will help to familiarize you with the types of calculations you will be performing as you study statistics.