Chapter 6

Measures of Relative Standing and the Normal Distribution

IN THIS CHAPTER

Bullet Working with the normal distribution — frontward and backward

Bullet Translating to a standard normal (Z) distribution

Bullet Calculating and interpreting Z-scores

Bullet Finding and understanding percentiles for the normal distribution

This chapter helps you get comfortable with the normal distribution — the most popular distribution in introductory statistics. You practice converting to the standard normal (Z) distribution and interpreting exactly what the distribution means. I show you how to find and interpret percentiles for the normal distribution, and you practice on “backwards normal” problems that instructors like so much (the problems that give you a percent and ask you to find the cutoff point).

Mastering the Normal Distribution

You may have heard of a bell curve. A bell curve describes data from a variable that has an infinite (or very large) number of possible values distributed among the population in a bell shape. This basically means a big group of individuals gravitate near the middle, with fewer and ...

Get Statistics Workbook For Dummies with Online Practice, 2nd Edition now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.