post3 - 2 Other Measures of Location: Quartiles,...

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1 STAT 511-2 Spring 2012 Jan 13, 2012 Jun Xie 1. Summary of graphical tools. 1.3 Measures of location Sample Mean Example 14 crack length of iron and steel ( m) x 1 = 16.1 x 2 = 9.6 x 3 = 24.9 x 4 = 20.4 x 5 = 12.7 x 6 = 21.2 x 7 = 30.2 x 8 = 25.8 x 9 = 18.5 x 10 = 10.3 x 11 = 25.3 x 12 = 14.0 x 13 = 27.1 x 14 = 45.0 x 15 = 23.3 x 16 = 24.2 x 17 = 14.6 x 18 = 8.9 x 19 = 32.4 x 20 = 11.8 x 21 = 28.5 Population mean, denoted as Sample median Order the n observations. Example 15 a sample of 12 recordings of Beethoven’s Symphony #9 with the random variable durations (min) 62.3 62.8 63.6 65.2 65.7 66.4 67.4 68.4 68.8 70.8 75.7 79.0 Population median Median is resistant to outliers, whereas mean is sensitive to outliers.
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Unformatted text preview: 2 Other Measures of Location: Quartiles, Percentiles, and Trimmed Means A trimmed mean is a compromise between mean and median. A 10% trimmed mean, for example, would be computed by eliminating the smallest 10% and the largest 10% of the sample and then averaging what remains. Categorical Data and Sample Proportions Example 13 1.3 Measures of variability Example 17 Fuel efficiency (mpg) of 2009 Ford Focus. A computing formula 3 Boxplots Example 19 thickness of the floor plate of an aboveground tank used to store crude oil. o The five-number summary o Outlier o Comparative boxplots...
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This note was uploaded on 02/20/2012 for the course STAT 511 taught by Professor Bud during the Fall '08 term at Purdue.

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post3 - 2 Other Measures of Location: Quartiles,...

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