Question: The television program Nightline once asked viewers whether the United Nations should continue to have its headquarters in the United States. Two phone numbers were

The television programNightlineonce asked viewers whether the United Nations should continue to have its headquarters in the United States. Two phone numbers were given. Viewers were asked to call one telephone number to respond "Yes" and the other to respond "No". More than 186,000 callers responded and 67% said "No". This is an example of

a. voluntary response sampling.

b. a survey with little bias because a large SRS was used.

c. a survey with little bias since someone who called would know his or her

opinion.

d. all of the above.

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