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

question 48

Multiple Choice

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 point estimate for the difference between the proportions is

• A) -0.02
• B) 0.048
• C) 100
• D) 66

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Definitions:

μ

The symbol for the mean or average of a set of data points in statistics.

Population Standard Deviation

A measure of the dispersion of a set of data points in a population away from its mean.

Sample Mean

The average of a set of values from a sample of a population, used to estimate the population mean.

Sample Standard Deviation

A measure of dispersion that indicates how much the values in a sample deviate from the sample mean.