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 number of degrees of freedom associated with this problem is
A) 4
B) 149
C) 1
D) 3

Question

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 number of degrees of freedom associated with this problem is
A) 4
B) 149
C) 1
D) 3

Quizplus · Accepted Answer

The degrees of freedom for a chi-square test of independence is calculated as (rows - 1) * (columns - 1). Here, there are 2 rows and 2 columns, so the degrees of freedom is (2-1)*(2-1) = 1.

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

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