 Quote by mathman
Xk is a sample from a population. n is the number of samples. All samples are from the same population, so the variance will be the same for each sample.
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Here is an example from my book where they use n as number of elements in a sample to calculate standard deviation:
http://bildr.no/view/1124676
I just cant see how that is possible friom the derivation given in the link in my first post