\begin{center}
 \begin{tabular}{*{2}{l}}
 \hline
               & Estimate  \\
              & (S.E.)  \\
\hline 
 \hline
  (Intercept)   &    40.591* \\
    &   ( 1.24) \\
  instcst   &    2.276* \\
    &   ( 0.133) \\
 \hline 
N   &    1155 \\
 $RMSE$       & 16.41  \\
 $R^2$       & 0.203  \\
 adj $R^2$       & 0.202  \\
 \hline\hline
* $p \le 0.05$\end{tabular}
\end{center}