Unformatted text preview: riginally big remains big.
and So the average squared deviation , called the
variance, can describe the variability of the
(2.4) 2 + (−3.6) 2 + (−6.1) 2 + (−0.4) 2 + (7.7) 2 115.38
5 Variance is a useful and often quoted quantity in
statistics. However, for the beginner, this quantity has
certain difficulty in interpretation, as the unit of
measurement (here, it is “squared thousand $”) is unusual.
To go back to our familiar unit ($), we take the square root
(to off-set the previous step of “squaring”), and call it the
standard deviation, which is de...
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- Spring '09
- Standard Deviation, Mean, Deviation, Errors and residuals in statistics