Population vs sample quantities

[@iskandariyah20]

instead of (Xi-miu)^2, shouldnt it (Xi-Xbar)^2 when you wrote the formula of S^2?

[@antoniolum1506]

I'm sure you're correct (x̅) is meant to be used in the Sample formula and µ in the Population formula.

[@brianclark4796]

yes

[@yingqiuzhou133]

Why is it N-1,rather than N in S^2

[@kottelkannim4919]

Because the latter is a biased estimator of the population variance:
proofwiki.org/wiki/Bias_of_Sample_Variance

[@OskarBienko]

Thank you for providing the link