6. Table C. 2 Page 497 in your text is for identifying the critical value for a t test. For each value of \( N \) given, find the \( d f \). Then, find the value of \( t \) crit for a two-tailed test.
\begin{tabular}{|l|l|l|l|}
\hline\( \alpha \) & \( \mathrm{N} \) & \( d f \) & tcrit (two-tailed) \( (+/-) \) \\
\hline .05 & 61 & & \\
\hline .05 & 30 & & \\
\hline .05 & 14 & & \\
\hline .01 & 121 & & \\
\hline .01 & 2 & & \\
\hline
\end{tabular}