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Unformatted text preview: • Sample median = (6.9+7.0)/2 = 6.95 • Sample Upper quartile = (8.4+8.5)/2 = 8.45 • Sample interquartile range (IQR) = 8.45  6.05 = 2.4 • Sample variance = 8.7208 • Sample standard deviation = 2.9531 (b) See the next page. (c) Note that Lower quartile  1.5IQR = 2 . 45 >5 . 3 = minimum point, and Upper quartile + 1.5IQR = 12 . 05 < 15 . 1 = maximum point. Thus, we have four potential outliers. They are 5.3, 4.9, 2.1, and 15.1. Since the data is the observed value of the lead concentration (in μg/m 3 ), it cannot be negative. In other words, 5.3 and 4.9 are outliers. 15 5 10 15 Figure 1: Boxplot for Q2b 3. • Sample mean = 590.4444 • Sample median = 572 • Mode = 572 2...
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This note was uploaded on 10/20/2011 for the course MATH 144 taught by Professor Yu during the Spring '11 term at HKU.
 Spring '11
 yu
 Statistics

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