ANSWERS A-39 Chapter 12 SECTION 12.1, PAGE 767 1. Statistics 3. Descriptive 5. Sample 7. Random 9. Stratified 11. Stratified sample 13. Cluster sample 15. Systematic sample 17. Convenience sample 19. Random sample 21. The patients may have improved on their own without taking honey. 23. Half the students in a population are expected to be below average. 25. The quality of a steak does not necessarily depend on the price of the steak. 27. Most driving is done close to home. Thus, one might expect more accidents close to home. 29. We don’t know how many of each professor’s students were surveyed. Perhaps more of Professor Fogal’s students than Professor Bond’s students were surveyed. Also, because more students prefer a teacher does not mean that teacher is a better teacher. For example, a particular teacher may be an easier grader and that may be why that teacher is preferred. 31. Just because they are more expensive does not mean that they will last longer. 33. There may be deep sections in the pond, so it may not be safe to go wading. 35. a) Year Average Price of a Movie Ticket Price ($) 0 2 4 6 8 10 12 2019 2020 2021 2022 2023 b) Year Average Price of a Movie Ticket Price ($) 9.1 0 9.3 9.5 9.7 9.9 10.1 10.3 10.5 10.7 2019 2020 2021 2022 2023 37. a) Year Age Median Age of the U.S. Population 0 5 10 15 20 25 30 35 40 2017 2018 2019 2020 2021 2022 47. a) 24 b) $4500 48. 30 49. 720 50. 504 51. 20 52. 3,628,800 53. a) 1 12,103,014 b) 1 302,575,350 54. 35,640 55. 560 56. 1 221 57. 1 12 58. 1 18 59. 1 24 60. 11 12 61. 5 182 62. 45 364 63. 2 13 64. 11 13 65. a) P x C ( ) ( )(0.6) (0.4) n x x n x = − b) P C (50) ( )(0.6) (0.4) 100 50 50 50 = c) 0.01034 66. 0.0512 67. a) 0.01024 b) 0.98976 CHAPTER TEST, PAGE 758 1. 11 25 2. 4 9 3. 5 9 4. 2 3 5. 1 36 6. 5 18 7. 5 12 8. 8 13 9. 18 10. Sample Space 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 R1 R2 R3 R4 R5 R6 B1 B2 B3 B4 B5 B6 G1 G2 G3 G4 G5 G6 R B G 11. 1 18 12. 4 9 13. 5 6 14. 1,581,840 15. a) 5:4 b) 5:4 16. $0 17. a) 121 228 b) 113 228 c) 53 113 d) 47 107 18. 120 19. a) 3 38 b) 35 38 20. 0.2304
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