Statistics Workbook For Dummies with Online Practice, 2nd Edition

Chapter 1

Summarizing Categorical Data: Counts and Percents

IN THIS CHAPTER

Making tables to summarize categorical data

Highlighting the difference between frequencies and relative frequencies

Interpreting and evaluating tables

Categorical data is data in which individuals are placed into groups or categories — for example gender, region, or type of movie. Summarizing categorical data involves boiling down all the information into just a few numbers that tell its basic story. Because categorical data involves pieces of data that belong in categories, you have to look at how many individuals fall into each group and summarize the numbers appropriately. In this chapter, you practice making, interpreting, and evaluating frequency and relative frequency tables for categorical data.

Counting On the Frequency

One way to summarize categorical data is to simply count, or tally up, the number of individuals that fall into each category. The number of individuals in any given category is called the frequency (or count) for that category. If you list all the possible categories along with the frequency for each, you create a frequency table. The total of all the frequencies should equal ...