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chapter_08

# chapter_08 - CHAPTER 8 SOLUTIONS AND MINI-PROJECT NOTES...

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CHAPTER 8 SOLUTIONS AND MINI-PROJECT NOTES CHAPTER 8 BELL-SHAPED CURVES AND OTHER SHAPES EXERCISE SOLUTIONS 8.1 a. 16% b. 97.5% c. 80% 8.2 a. 1 0.9 = 0.1, or 10% b. 1 0.4 = 0.6, or 60% c. 1 0.99 = 0.01, or 1% 8.3 a. 0.67 b. 0.67 c. 0.13 d. 2.05 8.4 a. 2.05 (same as 98% below). b. 0.00 (same as 50% below). c. 0.67 (same as 25% below). d. 1.28 (same as 90% below). 8.5 a. 84% 16% = 68%. b. 96% 10% = 86%. c. 84% 50% = 34%. 8.6 a. The standardized score is (116 100)/16 = 1.00; by Table 8.1 this is the 84th percentile. b. Both pictures are identical bell-shaped curves. The top picture should be centered at 100 and have a line at 116, with 84% of the area below the line at 116 and 16% of the area above it. The bottom picture should look identical, except it is centered at 0 and has the line at 1 instead of 116. 8.7 The picture should show a bell-shaped curve centered on 100. The interval from 90 to 110 should encompass 68% of the area, from 80 to 120 should encompass 95% of the area, and 70 to 130 should encompass 99.7% of the area. 8.8 a. The standardized score is (450 497)/115, or about 0.41, which is the 34th percentile. b. The standardized score is (92 100)/16 = 0.5, which is the 31st percentile.

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chapter_08 - CHAPTER 8 SOLUTIONS AND MINI-PROJECT NOTES...

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