Exhibit 11-9
The results of a recent poll on the preference of teenagers regarding the types of music they listen to are shown below.
$$\begin{array} { l c c }
&&\text { Teenagers Favoring }\
\text { Music Type } & \text { Teenagers Surveyed } & \text { This Type } \
\text { Pop } & 800 &384 \
\text { Rap } & 900 & 450\
\end{array}$$
-Refer to Exhibit 11-9. The 95% confidence interval for the difference between the two proportions is
A) 384 to 450
B) 0.48 to 0.5
C) 0.028 to 0.068
D) -0.068 to 0.028

Question

Exhibit 11-9
The results of a recent poll on the preference of teenagers regarding the types of music they listen to are shown below.
 $$\begin{array} { l c c } 
&&\text { Teenagers Favoring }\
\text { Music Type } & \text { Teenagers Surveyed } & \text { This Type } \
\text { Pop } & 800 &384 \
\text { Rap } & 900 & 450\
\end{array}$$
-Refer to Exhibit 11-9. The 95% confidence interval for the difference between the two proportions is
A) 384 to 450
B) 0.48 to 0.5
C) 0.028 to 0.068
D) -0.068 to 0.028

Quizplus · Accepted Answer

The 95% confidence interval for the difference between two proportions is calculated using the formula for the difference in sample proportions. The interval -0.068 to 0.028 captures the range where the true difference in proportions likely falls.

Exhibit 11-9 the Results of a Recent Poll on the Preference

Exhibit 11-9
the Results of a Recent Poll on the Preference