Topological Analysis, First Edition by Gordon Whyburn

By Gordon Whyburn

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Section 2 FOR HELP with mean, median, and mode, see TOOLBOX, p. 596 Displaying Data 15 GOAL b b LEARN HOW TO... make and use stem-and-leaf plots ³ AS YOU... analyze the ages of famous pop and country musicians ³ . . . . . . . ³ ³ STEM and LEAF One way to organize data is in a stem-and-leaf plot. The stem-andleaf plot below shows the ages of the top 20 solo pop musicians when they had their first #1 singles. These musicians were rated as the top artists from 1955 to 1999.

M Without counting, can you tell which card shows two patterns with the same number of dots? Exercise 24 checks that you can use rates. Rates and Data Displays 13 Section 1 Extra Skill Practice You will need: • compass (Ex. 7) • protractor (Ex. 7) Tell whether the given rates are equivalent. You may need to use the Table of Measures on page 601. 1. $365,000/year; $100/day 2. 15 gal/min; 2 pt/sec Calorie Sources For Exercises 3–5, use the circle graph at the right.

Exercise 18 checks that you can interpret stem-andleaf plots and boxand-whisker plots. 2 2 2 3 3 3 4 5 5 5 6 6 7 7 8 9 9 3 4 6 6 7 8 9 9 9 3 4 6 6 6 8 8 8 7 3|1 represents position number 31. a. Suppose a box-and-whisker plot was constructed from the data above. What value would be the lower extreme? the upper extreme? the median? b. Where would the data value 11 be on the box-andwhisker plot? For example, would it be on the lower whisker? c. Which whisker would be longer, the upper whisker or the lower whisker?

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