ODD ANSWERS A55 53. John Wayne: z ≈ 2.09; Gig Young: z ≈ 0.43; The age of John Wayne was more than 2 standard deviations above the mean age of Best Actor winners, which is unusual. The age of Gig Young was less than one standard deviation above the mean age of Best Supporting Actor winners, which is not unusual. 55. 5 57. (a) The distribution of the Punk Rock Concert is symmetric. The distribution of the Jazz Concert is skewed right. The Punk Rock Concert has less variation. (b) The Jazz Concert is more likely to have outliers because it has more variation. (c) The Punk Rock Concert, because 68% of the data should be between {16.3 of the mean. (d) No, you do not know the number of songs played at either concert or the actual lengths of the songs. 59. (a) 24, 2 (b) 0 5 1015202530 9 16 24 2 7 11 13 61. (a) 1 (b) 0 102030405060708090 83 23 32 46 52.5 1 63. Answers will vary. Uses and Abuses for Chapter 2 (page 114) 1. Answers will vary. 2. No, it is not ethical because it misleads the consumer to believe that drinking red wine is more effective at preventing heart disease than it may actually be. Review Exercises for Chapter 2 (page 116) 1. Class Midpoint Class boundaries 26 – 31 28.5 25.5–31.5 32 – 37 34.5 31.5–37.5 38 – 43 40.5 37.5–43.5 44 – 49 46.5 43.5–49.5 50 – 55 52.5 49.5–55.5 Frequency, f Relative frequency Cumulative frequency 5 0.25 5 4 0.20 9 6 0.30 15 3 0.15 18 2 0.10 20 gf = 20 Σ f n = 1 3. Actual volume (in ounces) Frequency 2 4 6 8 11.875 11.915 11.955 11.995 12.035 12.075 12.115 Liquid Volume 12-oz Cans 5. Class Midpoint Frequency, f 79 – 93 86 9 94 – 108 101 12 109 – 123 116 5 124 – 138 131 4 139 – 153 146 2 154 – 168 161 1 gf = 33 Number of rooms Frequency 71 86 101 116 131 146 161 176 2 4 6 8 10 12 14 Rooms Reserved 7. Pollution Indices of U.S. Cities 2 0 3 5 7 9 Key: 20 0 = 20 3 0 0 1 1 2 6 7 9 9 4 2 3 4 5 5 5 7 5 0 2 6 3 Sample answer: Most U.S. cities have a pollution index from 30 to 47. 9. College Students’ Activities and Time Use Sleeping 36.67% Leisure and sports Working 16.67% 9.58% Educational activities 14.58% Other 22.50% Sample answer: Full-time university and college students spend the least amount of time working.
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