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The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

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Standard Deviation

This method is pretty straightforward. The standard deviation is simply the square root of the variance. Just as with the variance, there is a standard deviation for both the sample and population, as shown in the following equations.
Sample standard deviation:
113
Population standard deviation:
114
def•i•ni•tion
A standard deviation is the square root of a variance.
To calculate the standard deviation, you must first calculate the variance and then take the square root of the result. Recall from the previous sections that ...

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