101 Ch. 4

# 101 Ch. 4 - Chapter Four Displaying Quantitative Data Where...

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Unformatted text preview: Chapter Four Displaying Quantitative Data Where do we start? • Quantitative Data is a set that can be numerically represented. Percent of Population over 65 per state (2000) 13.0 5.7 13.0 14.0 10.6 9.7 13.8 11.2 13.0 11.7 17.6 9.6 13.3 11.3 12.1 12.4 14.9 13.3 12.5 11.6 14.4 11.3 13.5 12.3 12.1 12.1 13.5 13.4 13.6 11.0 12.0 13.2 11.7 12.9 12.0 14.7 13.3 13.2 12.8 15.6 14.5 12.1 14.3 12.4 9.9 8.5 12.7 11.2 15.3 13.1 Dealing With a Lot of Numbers... • When looking at large sets of quantitative data, it can be difficult to get a sense of what the numbers are telling us without summarizing the numbers in some way. • In this chapter, we will concentrate on graphical displays of quantitative data. What do these data tell us? • Make a picture – Histogram – Stem-and-Leaf Display • Distribution (of the data) – Where are the values? • Shape • Center • Spread Displaying Quantitative Data • Histogram – Give each graph a title – Give each one of the axes a label – Make as neat as possible • Computer • Grid paper Displaying Quantitative Data • Histogram – Divide data values into equal-width piles (called bins ) – Count number of values in each bin – Plot the bins on x-axis – Plot the bin counts on y-axis Example – Population Over 65 • Sort data – Using Excel or any other software....
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101 Ch. 4 - Chapter Four Displaying Quantitative Data Where...

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