Election-day polls are taken from voting precincts selected, Ask an Expert

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Explain why the polls that are so frequently quoted during early returns on Election Day TV coverage are an example of cluster sampling.

a) Election-day polls are taken from voting precincts selected because they are believed to be representative of all voters.

b) Election-day polls are taken from small clusters of each district.

c) Each state is regarded as a cluster.

d) None of the above.

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