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The Standard Deviation :: Population versus Sample Standard Deviation
Things to remember:
σ is the population standard deviation which we usually don't know.
s is the sample standard deviation which is an estimate of the unknown population standard deviation.
We divide the sum of squares by 1 less than the sample size to account for the error in estimation from the sample standard deviation (called the degrees of freedom).
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September 26, 2015 | anonomous wrote:
Nobody explained why it is better to divide into n-1 instead of n
March 15, 2009 | Anthoyn wrote:
sample standard deviation (called the degrees of freedom). the df n-1 should be earlier in the sentence otherwise it reads sort of like the sample standard deviation(ALSO called the degrees of freedom
February 17, 2009 | Rodrigo Averna wrote:
Why did we didvide the sum of sqared values by " one less than the sample size" and not the sample size?