Chap004 - C HAPTER 4 D ESCRIBING D ATA : D ISPLAYING AND E...

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Unformatted text preview: C HAPTER 4 D ESCRIBING D ATA : D ISPLAYING AND E XPLORING D ATA 1. a. Dot plot b. 15 c. 7 and 1, respectively, The range is 6. d. 2 and 3 2. a. 19 and 4, respectively, range is 15 b. 12 3. Median = 53 found by (11 + 1)(1/2) therefore 6 th value in from lowest. Q 1 = 49 found by (11 + 1)(1/4) therefore 3 rd value in from lowest Q 3 = 55 found by (11 + 1)(3/4) therefore 9 th value in from lowest 4. Median = 9.53, found by (9.45 + 9.61)/2 Q 1 = 7.69 found by 7.59 + (7.99 7.59) Q 3 = 12.59 found by 12.22 + (12.71 12.22)3/4 5. a. Q 1 = 33.25 Q 3 = 50.25 b. D 2 = 27.8 D 8 = 52.6 c. P 67 = 47 6. a. Median = 58 b. Q 1 = 51.25 Q 3 = 66.0 c. D 1 = 45.3 D 9 = 76.4 d. P 33 = 53.53 7. a. 350 b. Q 1 = 175 Q 3 = 930 c. 755, found by 930 175 d. Less than zero, or more than about 2060 e. There are no outliers f. The distribution is positively skewed 8. a. 450 b. Q 1 = 300 Q 3 = 700 c. 400, found by 700 300 d. Less than zero or more than 1300 e. One outlier at about 1500 f. Distribution is positively skewed Chapter 4 33 9. The distribution is somewhat positively skewed. Note that dashed line above 35 is longer than below 18.----------------------------| + |-------------------------------------------+-------+-------+-------+-------+-------+--- 14 21 28 35 42 49 10. The median is $253. About 25% of the semi-private rooms are less than $214 and 25% above $304. The distribution is negatively skewed. 11. a. The mean is 30.8, found by 154/5. The median is 31.0 and the standard deviation is 3.96, found as 62.8 4 . b.- 0.15, found by 3(30.8 31.0) 3.96- . c. Salary 36 1.313131 2.264250504 26- 1.21212- 1.780894343 33 0.555556 0.171467764 28-0.70707-0.353499282 31 0.050505 0.000128826 0.301453469 0.125 found by ( 29 5 0.301 (4)3 12. a. The mean is 542, found by 8130/15. The median is 546 and the standard deviation is 25.08, found as 25....
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Chap004 - C HAPTER 4 D ESCRIBING D ATA : D ISPLAYING AND E...

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