Chapter 20

# Top Ten Statistical Formulas

IN THIS CHAPTER

Breaking down the most commonly used statistical formulas

Practicing the calculations

Understanding the properties and behavior of these formulas

This chapter reviews my top ten statistical formulas and the steps and tips for calculating them. I provide a nice last-minute review/refresher to see what you remember and to show you what you need to spend a little more time on. You also get some tips to help you check your answers and to let you know what to expect your results to look like and why.

## Mean (or Average)

The mean, or the average of a data set, is one way to measure the center of a numerical data set. The notation for the mean is . The formula for the mean is , where x represents each of the values in the data set.

To calculate the mean, you

1. Add up all the numbers in ...

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