2.2 Graphical Methods for Describing Quantitative Data
Teaching Tip
Explain that quantitative data must be condensed in some manner to generate any kind of meaningful graphical summary of data.
Recall from Section 1.4 that quantitative data sets consist of data that are recorded on a meaningful numerical scale. To describe, summarize, and detect patterns in such data, we can use three graphical methods: dot plots, stem-and-leaf displays, and histograms. Since most statistical software packages can be used to construct these displays, we’ll focus here on their interpretation rather than their construction.
For example, the Environmental Protection Agency (EPA) performs extensive tests on all new car models to determine their mileage ratings. ...
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