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Unformatted text preview: (x x )2 n1 (1690.6)2 + (4590.6)2 +(8290.6)2 + (12290.6)2 +(18890.6)2 4 (74.6)2+ (45.6)2+ (8.6)2 +(31.4)2 + (97.4)2 4 (5565.16) + (2079.36) + (73.96) + (985.96) + (9486.76) 4 18191.2 4 4547.8 = Sample Variance, uninterpretable =67.44 Standard deviation 1) Sample Variance 2) Population standard deviation 3) Population Variance 4) Sam ple standard deviat ion i. Use Computat ional form ula for variance ( X) X 2 2 n n1 (300)
2 = 11000 10 9 90000 10 11000 9 110009000 9 2000 9 = 222.2= standard deviation equals 14.9 (50) ii. 5 2 900 4 2500 5 900 = 10 4 (1000)
2 = 900 500 = 400 = Sam ple Variance= 100 Stdev 4 4 200 iii. 7500 199 1000000 200 7500 =3.54 199 199 = 75005000 = 12.563 Sample Variance St Dev Coefficient of Variation 1) s 100 45 125 =.36 = 36 x 65 155 = .42= 42 more volatility 2) 15 28 26 87 = .536=53.6 more volatility = .299=29.9 ...
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 '10
 Cohn,SaulUri

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