\begin{align} \mathrm{Var}\left[X\right] & = \frac{1}{n-1} \sum{j=1}^g (k-1) Vj + k(g-1) \mathrm{Var}\left[Ej\right] \ & = \frac{k-1}{n-1}\left(\sum{j=1}^g Vj + \frac{k(g-1)}{k-1} \mathrm{Var}\left[Ej\right]\right) \end{align}

Wednesday, 30 September 2020 09:13 GMT