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Unformatted text preview: point is still the population mean, , not x . The sample data values are more naturally clustered around their sample mean than around the population mean. In order to make s 2 a better estimate for 2 , the population variance, we inflate our estimate by dividing by n 1 instead of n . Remember, for example: 1 4 > 1 5 . Then, s 2 will be an unbiased estimator of 2 in that it does not have an automatic tendency to consistently over or underestimate 2 ....
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 Fall '09
 KIM
 Variance

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