6. (2b, 7-11) A marketing company decided to conduct a sociological study to find out what portion of the urban population primarily gets their news from radio broadcasts, what portion from television programs, what portion from the press, and what portion from the internet. For the study, it was decided to use a sample of 2000 randomly selected email address owners. Can such a sample be considered representative? Justify your point of view.
# Solution.

The sample is not representative, as the two events:

$$
\begin{gathered}
A=\{y \text { of the person has an email }\} \\
\text { and } \\
B=\{\text { the person uses the Internet }\}
\end{gathered}
$$

are dependent. On the other hand, people who use the Internet mostly use it, among other things, for reading news. Thus, the percentage of people who will say they get their news from the Internet in this sample will be significantly higher than among all people.

Answer: cannot.