Perform a Chi-Square Independence Test Using the Critical Value Approach

Essay

Perform a chi-square independence test using the critical value approach, provided the conditions for using the test aremet. Be sure to state the hypotheses and the significance level, to obtain the expected frequencies, to obtain the criticalvalue, to compute the value of the test statistic, and to state your conclusion.
-Tests for adverse reactions to a new drug yielded the results given in the table. At the 0.05 significance level, do the data provide sufficient evidence to conclude that an association exists between the treatment (drug or placebo)and the reaction (whether or not headaches were experienced)? $\begin{array} { r | r c } & \text { Drug } & \text { Placebo } \\ \hline \text { Headaches } & 11 & 7 \\ \text { No headaches } & 73 & 91 \end{array}$