COMMunication
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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*}