sample_variance=

introduction==

%%visits: 2 ## intuition== ## rigour== Show that $\frac{(n-1)S^2}{\sigma ^2}$

{{file :~ vimwiki/math/diary/screenshot_20211020_092924.png}}

Chapter 4. Theory of estimation.

Find a property of a population with samples.

there is an [[estimator]] which is usually and used in many places as S² ## exam clinic== The [[z-test]] is used when variance is known, but not when known we use the varance ## examples and non-examples== ## resources== [[variance]] tags :math:

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