Chap02_part1 - Solutions to End-of-Section and Chapter...

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Solutions to End-of-Section and Chapter Review Problems 119 CHAPTER 2 2.1 Ordered array: 63 64 68 71 75 88 94 2.2 Stem-and-leaf of Finance Scores 5 34 6 9 7 4 8 0 9 38 n = 7 2.3 Ordered array: 73 78 78 78 85 88 91 2.4 Ordered array: 50 74 74 76 81 89 92 2.5 (a) Ordered array: 9.1 9.4 9.7 10.0 10.2 10.2 10.3 10.8 11.1 11.2 11.5 11.5 11.6 11.6 11.7 11.7 11.7 12.2 12.2 12.3 12.4 12.8 12.9 13.0 13.2 (b) The stem-and-leaf display conveys more information than the ordered array. We can more readily determine the arrangement of the data from the stem-and-leaf display than we can from the ordered array. We can also obtain a sense of the distribution of the data from the stem-and-leaf display. (c) The most likely gasoline purchase is between 11 and 11.9 gallons. (d) Yes, the third row is the most frequently occurring stem in the display and it is located in the center of the distribution. (e) Generalization from this sample is limited by the fact it was selected from only one service station on the New Jersey Turnpike. Nothing else is known about the sample, so caution should be used in saying anything about the population of gasoline purchases. 2.6 (a) Ordered array: 5, 6, 10, 11, 11, 12, 13, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 19, 19, 20, 22, 23, 25, 28, 30, 34 (b) PHStat output: Stem-and-Leaf Display for PE Ratio Stem unit: 10 0 5 6 1 0 1 1 2 3 4 4 4 5 5 5 5 6 6 6 6 7 7 7 9 9 2 0 2 3 5 8 3 0 4
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120 Chapter 2: Presenting Data in Tables and Charts 2.6 (c) The stem-and-leaf display provides more information because it not only orders cont. observations from the smallest to the largest into stems and leaves, it also conveys information on how the values distribute and cluster over the range of the observations in the data set. (d) No, there do not seem to be more undervalued stocks than overvalued stocks because there are 2 stocks with a P/E ratio below 10 and 2 stocks with P/E ratios above 30. 2.7 (a) Ordered array: $15 $15 $18 $18 $20 $20 $20 $20 $20 $21 $22 $22 $25 $25 $25 $25 $25 $26 $28 $29 $30 $30 $30 (b) PHStat output: Stem-and-Leaf Display for Bounced-Check Fee Stem unit: 10 1 5 5 8 8 2 0 0 0 0 0 1 2 2 5 5 5 5 5 6 8 9 3 0 0 0 (c) The stem-and-leaf display provides more information because it not only orders observations from the smallest to the largest into stems and leaves, it also conveys information on how the values distribute and cluster over the range of the observations in the data set. (d) The bounced checked fees seem to be concentrated around $20 and $25 since there are five observations of each of the two values in the sample of 23 banks. 2.8 (a) 0 0 5 5 5 5 5 5 6 6 6 7 7 7 8 8 9 9 9 10 10 10 10 10 12 12 (b) Excel output: 00 0 1 2 3 4 50 0 0 0 0 0 60 0 0 70 0 0 80 0 90 0 0 100 0 0 0 0 11 120 0 (c) The stem-and-leaf display provides more information because it not only orders observations from the smallest to the largest into stems and leaves, it also conveys information on how the values distribute and cluster over the range of the
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Chap02_part1 - Solutions to End-of-Section and Chapter...

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