Below is partial Excel output from a multiple regression, with some values missing: $$\begin{array}{|l|r|r|r|r|r|} \hline \multicolumn{2}{|c|}{\mbox{Regression Statistics}} & & & & \\ \hline \mbox{Multiple R} & 0.6418 & & & & \\ \hline \mbox{R Square} & 0.4119 & & & & \\ \hline \mbox{Adjusted R Square} & 0.2908 & & & & \\ \hline \mbox{Standard Error} & & & & & \\ \hline \mbox{Observations} & 42 & & & & \\ \hline & & & & & \\ \hline \mbox{ANOVA} & & & & & \\ \hline & \mbox{df} &\mbox{SS} &\mbox{MS} &\mbox{F} &\mbox{Significance F} \\ \hline \mbox{Regression} & 7 & 879 & 125.57 & 3.4 & 0.00734782\\ \hline \mbox{Residual} & 34 & 1255 & 36.91 & & \\ \hline \mbox{Total} & 41 & 2134 & & & \\ \hline \end{array}$$

Determine the following from the output:

Standard Error =