33. In an experiment of immunization of cattle for tuberculosis, the following results were obtained.
\begin{tabular}{|l|c|c|}
\hline & Affected & Unaffected \\
\hline Inoculated & 12 & 26 \\
\hline Non-inoculated & 16 & 6 \\
\hline
\end{tabular}
Test whether the vaccine is effective in controlling tuberculosis. Use \( \alpha=0.05 \)
