ch3measuresofvariability

To get rid of the the sign trouble we could use the

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Unformatted text preview: e is the signs. To get rid of the The sign trouble, we could use the absolute values: sign Mean Absolute Deviation= ∑|x MAD = i −µ| N = 2.4 + 3.6 + 6.1 + 0.4 + 7.7 20.2 = 5 5 = 4.04 Thus, on the average, each datum is 4.04 units from Thus, the mean Note: The idea of MAD is simple. But, in mathematics, Note The absolute values are not easy to handle. So, MAD is not popularly used. not C: Standard Deviation C: To get rid of the “sign effect”, and to avoid using absolute values, we find “squaring” a useful tool. After squaring, After (i) All values become positive (ii) A number originally small in magnitude remains small number and a number o...
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