Exhibit 11-3
in Order to Determine Whether or Not a Particular

Exhibit 11-3
In order to determine whether or not a particular medication was effective in curing the common cold, one group of patients was given the medication, while another group received sugar pills. The results of the study are shown below.
$\begin{array}{lll}&\text { Patients Cured }&\text { Patients Not Cured }\\\text { Received medication } & 70 & 10 \\\text { Received sugar pills } & 20 & 50\end{array}$ We are interested in determining whether or not the medication was effective in curing the common cold.
-Refer to Exhibit 11-3. The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals

A) 3.84
B) 7.81
C) 5.99
D) 9.34