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Chapter_1__selected - INTRODUCTION AND DESCRIPTIVE...

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CHAPTER 1 INTRODUCTION AND DESCRIPTIVE STATISTICS 1-14. First, order the data: -1.2, 3.9, 8.3, 9, 9.5, 10, 11, 11.6, 12.5, 13, 14.8, 15.5, 16.2, 16.7, 18 The median, or 50th percentile, is the point in position 16(50/100) = 8. The point is 11.6. First quartile is in position 16(25/100) = 4. Point is 9. Third quartile is in position 16(75/100) = 12. Point is 15.5. 55th percentile is in position 16(55/100) = 8.8. Point is 12.32. 85th percentile is in position 16(85/100) = 13.6. Point is 16.5. 1-16. Order the data: 1, 1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7. Lower quartile is the 25th percentile, in position 16(25/100) = 4. Point is 2. The median is in position 16(50/100) = 8. The point is 3. Upper quartile is in position 16(75/100) = 12. Point is 5. IQR = 5 - 2 = 3. 60th percentile is in position 16(60/100) = 9.6. Point is 4. 1-20. For the data of Problem 1-14 : Mean = 11.2533 Median = 11.6 Mode: none 1-24. For the data of Example 1-1 : Mean = 163,260 Median = 166,800 Mode: none 1-26. Mean = 29.0

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