lec10_3143 - Lies damn lies and statistics-Benjamin...

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BIOL 3143 - Figures, Tables and Statistics 1 Lies, damn lies and statistics --Benjamin Disraeli
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BIOL 3143 - Figures, Tables and Statistics 2 First get the facts, then you can distort 'em as much as you want --Mark Twain
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BIOL 3143 - Figures, Tables and Statistics 3 The basis of optimism is sheer terror -Oscar Wilde beware of  extrapolation!
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BIOL 3143 - Figures, Tables and Statistics 4 Statistics show every two minutes another statistic is created --Anon
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BIOL 3143 - Figures, Tables and Statistics 5 Box and Whisker Plots 18  27 34  52  54 59 61  68  78 82 85  87  91 93  100 median =  68 lower quartile =  52 , upper quartile =  87 Extremes = range =  18  and  100 InterQuartile Range =  87  -  52  = 35 Outliers <> median  ±  1.5 x IQR                       = 68  ±  1.5 x 35                       = -15.5 to 120.5 (no outliers)
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BIOL 3143 - Figures, Tables and Statistics 6 A Famous Case
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BIOL 3143 - Figures, Tables and Statistics 7 Ozone and Outliers The 'ozone hole' above Antarctica In 1985 three researchers (Farman, Gardinar and Shanklin) were puzzled by some 
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