COMMunication
RESearch.NET

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\begin{eqnarray*} \large {s_b} & = & \sqrt { \cfrac { \sum(Y_i - \hat{Y})^2} / {n-2} { \sum{(X_i - \overline{X})^2} } } \\ & = & \sqrt { \cfrac {1}{{n-2}} \cdot \cfrac {\sum(Y_i - \hat{Y})^2} { \sum{(X_i - \bar{X})^2} } } \\ \end{eqnarray*}