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

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Variance

One of the most common measurements of dispersion in statistics is the variance, which summarizes the squared deviation of each data value from the mean. The formula for the sample variance is:
090
where:
s2 = the variance of the sample
091= the sample mean
n = the size of the sample (the number of data values)
092= the deviation from the mean for each value in the data set
def•i•ni•tion
The variance is a measure of dispersion that ...

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