Chapter 3
Organizing Categorical Data: Charts and Graphs
IN THIS CHAPTER
Making charts and graphs
Making sense of the information presented in charts and graphs
Spotting misleading charts and graphs
Organizing categorical data involves listing each of the possible categories that the responses can take on, along with the number or percentage of individuals in each group. In this chapter, you practice making, interpreting, evaluating, and critiquing charts and graphs for categorical data.
Making, Interpreting, and Evaluating Pie Charts
A pie chart is a circle, or pie, whose slices show the percentage of individuals that fall into each category. Larger slices signify categories that include more individuals than the smaller slices. Before you make a pie chart, you can first summarize the data in table format. A frequency table shows how many individuals fall into each category (the sum of which is the total sample size). A relative frequency table shows what percentage of individuals fall into each category by taking the frequencies and dividing by the total sample size. The relative frequencies should sum to 1 or 100 percent (subject to possible round-off error).
Not all pie charts ...
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