1.59 Discovering outliers.
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Whether an observation is an outlier is a matter of judgment. It is convenient to have a rule for identifying suspected outliers. The is in common use:
The stemplot in Exercise 1.31 (page 22) displays the distribution of the percents of residents aged 65 and older in the 50 states. Stemplots help you find the five-number summary because they arrange the observations in increasing order.
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The following three exercises use the Mean and Median applet available at the text website to explore the behavior of the mean and median.
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(a) , , , , . (b) . . So, Utah with 9.5 percent and Alaska with 8.5 percent are low outliers. . So, Florida with 18.2 percent is a high outlier.