ho12_ch09b_wk09_Su11 (modified)
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tnguyen. (May 11, 2011). ho12_ch09b_wk09_Su11 (modified). Retrieved Nov 06, 2014, from UMass Boston OpenCourseware Web site: http://ocw.umb.edu/environmental-earth-and-ocean-sciences/eeos-601-introduction-to-applied-statistics-summer-2011/ho12_ch09b_wk09_Su11%20%28modified%29.pdf.