I want answers with explaination. Radio and television stations often air contro

Question

I want answers with explaination.

Radio and television stations often air controversial issues during broadcast time and ask viewers to indicate their agreement or disagreement with a given stand on the issue. A poll is conducted by asking those viewers who agree to call a certain 900 telephone number and those who disagree to call a second 900 telephone number. All respondents pay a fee for their calls. (a) Does this polling technique result in a random sample? Yes, this is a random sample. No, this is not a random sample. (b) What can be said about the validity of the results of such a survey? The results of the survey would be valid because separate phone numbers were offered for those who agreed and disagreed. The results of all voluntary polls are valid. The results of the survey would not be valid because the sample was not random. The results of the survey would not be valid because the number of people who called in was not reported. The results of the survey would be valid because the sample was random. Do you need to worry about a margin of error in this case? Yes No

Explanation / Answer

a)

Answer: No

That is, this is not a random sample.

Since the persons are the only viewers and we don’t know if they are agree or disagree to call certain 900 telephone number. And also pay fee for their calls.

Therefore, this not a fixed sample

b)

Answer: C

That is, the result of the survey would not be valid because the number of people who called was not reported.

c)

Yes.

Since the sample observations was not random and there exist a selection bias.

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