A correspondent for a news program appears evenings on television throught the c

Question

A correspondent for a news program appears evenings on television throught the country. This correspondent asked viewers to call in with their answer to this questions: "if you had to do it all over again, would you vote for the president?" Of the more than 10,000 viewers who responded, 70% said no.

Wha can be concluded about the viewers?

a. No meaningful conclusion is possible wihtout knowing something more about the characteristics of the correspondent's vierwers.

b. This is a legititmate sample, randomly drawn from the correspondent's viewers and of suficient size to conclude that most of the vieweres would have second thoughts about voting for the president.

c. the survey would be more meaningful if the correspondent had used a control group.

d. no meaningful conclusin is possible due to voluntary response bias.

Explanation / Answer

The correct option is:

d. no meaningful conclusion is possible due to voluntary response bias.

in voluntary response sampling, people decide whether to join the sample in response to an open invitation. Voluntary response samples attract people who feel strongly about the issue in question, that leads bias. This suggests that the conclusion might not be valid.

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