The Gallup Poll correctly predicted George H. W. Bush’s 1988 victory using only 4,089 interviews. Why, then, did the Gallup Poll in 1948 wrongly predict Dewey’s victory over Truman when the prediction was based on 50,000 interviews?
A) People in only one state were interviewed.
B) Multistage cluster sampling was used.
C) Quota sampling was used.
D) Random sampling was used.
Answer: C
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