Alternative Equation Formats

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MathML

{\hat{a}}^{2} = {(r - 1)}^{- 1} \sum_{i = 1}^{r} (δ_{i} - {\bar{δ}}_{.})^{2} / {\bar{δ}}_{.}^{2}

$\hat a^2 = {(r-1)}^{-1} \sum _{i=1}^ r (\delta _ i - \bar\delta _.)^2 / \bar\delta _.^2$