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Unformatted text preview: C HAPTER 3 D ESCRIBING D ATA : N UMERICAL M EASURES 1. 5.4 = found by 27/5 2. 5.5 = found by 33/6 3. a. Mean = 7.0, found by 28/4 b. (5 7) (9 7) (4 7) (10 7) + + + = 4. a. 4.2 found by 21/5 b. (1.3 4.2) (7.0 4.2) (3.6 4.2) (4.1 4.2) (5.0 4.2) + + + + = 5. 14.58, found by 43.74/3 6. $20.95, found by $125.68/6 7. a. 15.4, found by 154/10 b. Population parameter since it includes all the salespersons at Moody Insurance Agency. 8. a. 23.9, found by 167/7 Chapter 3 26 b. Population parameter since it includes all the calls during a sevenday period. 9. a. $54.55, found by $1091/20 b. A sample statistic, assuming that the power company serves more than 20 customers. 10. a. 10.73, found by 161/15 b. Sample of RNs 11. $22.91, found by 300($20) 400($25) 400($23) $25,200 300 400 400 1100 + + = + + 12. $1.50 found by ($40 + $35)/50 13. $1.7734, found by [80.2($1.749) + 15.2($1.849) + 4.6($1.949)]/100 14. $143.75, found by ($1000 +$750 + $4000)/40 15. a. no mode b. The given value would be the mode c. 3 and 4, bimodal 16. Median = 33, Mode = 15 Chapter 3 27 17. Median = 5 Mode = 5 18. Median = 10.5 Mode = 8 19. a. Median = 2.9 b. Mode = 2.9 20. The median is 15, found by (13 + 17)/2 Half of the flights are less than 15 minutes late and half of them are more than 15 minutes late. 21. a. 7.75, found by 93/12 b. 7.65, found by (7.8 + 7.5)/2 and 8.6 (Jan and Dec.) c. 8.6, found by 34.4/4 and 8.6 Both the mean and median are somewhat higher. 22. Treat Wind Direction as nominal, Temperature as interval, and Pavement as ordinal data. That would lead to a mod (Southwest) for the first column, a mean (91) for the second column, and a median (Trace) for a third. 23. 12.8 found by 5 (1.08)(1.12)(1.14)(1.26)(1.05) 1.128 = 24. 6.0 percent increase, found by 8 (1.02)(1.08)(1.06)(1.04)(1.10)(1.06)(1.08)(1.04) 1.060 = Chapter 3 28 25. 12.28 percent increase, found by 5 (1.094)(1.138)(1.117)(1.119)(1.147) 1.228 = 26. 20.7% found by 6 46,282,200 1 14,968,000 27. 2.53% found by 11 184.6 1 140.3 28. 4.25% found by 28 1.941 1 0.605 29. 10.76% found by 5 70 1 42 30. 5.49% for public colleges found by 8 7628 1 4975 5.70% for private colleges found by 8 19,143 1 12,284 The rates of increase are about the same with private colleges slightly higher.The rates of increase are about the same with private colleges slightly higher....
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 Spring '08
 HALEY

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