A-44 ANSWERS b) and c) 2 Class 35 4 6 1 3 5 36 37 40 41 42 38 39 43 44 45 Frequency 7. a) c) A cluster sample consists of dividing the population into sections. Then randomly select sections to use and either select all the items in the selected sections or a random sample of items from the selected sections. d) A stratified sample consists of dividing the population into strata and then taking a random sample from each strata. e) A convenience sample uses data that are easily or readily obtained. 3. The candy bars may have lots of calories, or fat, or sodium. Therefore, it may not be healthy to eat them. 4. Sales may not necessarily be a good indicator of profit. Expenses must also be considered. 5. a) 0 30 60 90 120 150 180 2022 2021 Number of Amazon Prime Subscribers (millions) 151.9 157.4 b) 150 151 152 153 154 155 156 157 158 2022 2021 Number of Amazon Prime Subscribers (millions) 151.9 157.4 6. a) Class Frequency 35 1 36 3 37 6 38 2 39 3 40 0 41 4 42 1 43 3 44 1 45 1 High Temperature Number of Cities 58– 62 1 63– 67 4 68–72 9 73–77 10 78–82 11 83–87 4 88–92 1 b) and c) 60 65 70 75 80 85 90 2 4 6 8 10 12 Average Daily Temperature Number of Cities Average Monthly High Temperature in July for Selected Cities d) | 5 8 represents 58 5 8 6 3 6 6 7 8 8 9 70111223334555667999 8000012223447 9 1 8. 78 9. 79 10. No mode 11. 78 12. 26 13. 80 8.94 ≈ 14. 18 15. 18 16. 12 and 17 17. 18.5 18. 19 19. 40 6.32 ≈ 20. 68.26% 21. 95.44% 22. 94.52% 23. 5.48% 24. 72.57% 25. 34.13% 26. 34.46% 27. 28.98% 28. 2.28% 29. a) Number of Bears Sighted Number of Hiking Permits 160 150 140 130 120 110 1500 1700 1900 700 900 1100 1300 Bear Sightings y x b) Yes; positive c) 0.925 d) Yes e) y x 0.04 88.17 = + f) 148 ≈ bears
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