Tests for Adverse Reactions to a New Drug Yielded the Results

Essay

Tests for adverse reactions to a new drug yielded the results given in the table. At the 0.05 significance level, test
the claim that the treatment (drug or placebo) is independent of the reaction (whether or not headaches were
experienced). $$\begin{array} { r | r r } & \text { Drug } & \text { Placebo } \\\hline \text { Headaches } & 11 & 7 \\\text { No headaches } & 73 & 91\end{array}$$