ch3measuresofvariability

The standard deviation is a deviation standard used

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Unformatted text preview: = 20.5 − 12.8 = 7.7 Large 7.7>4.8037 Thus, the standard deviation is a “not-large”, “not-small” deviation. The standard deviation is a deviation standard, used to tell the largeness or smallness of any other individual deviation. individual It can be seen that the variance is the average of the squared deviations. The s.d. is the square root of the variance. the Example 2: Example Find the standard deviation for each of the data sets for Company A and Company B. Company A : 6.7, 9.2, 12.4, 15.2, 20.5 B : 7.3, 8.7, 10.7, 16.5, 21.8, 55.0 µ = 20 7.3, Solution: For Company A, σ A = 4.8037 , found above. For Company B, For (8.7 − 20) 2 + (10.7 − 20) 2 + ......... + (55 − 20) 2 ∴σ B = 6 1615.96 6 = 16.4112 = Co...
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