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A Gallup Poll asked, "In general, how often do you experience stress in your daily life - never, rarely, sometimes, or frequently?"
Gallup's report said, "Results are based on telephone interviews with 1,027 national adults, aged 18 and older, conducted Dec. 6-9, 2007."
What is the population for this sample survey? What is the sample?

A.The population is the 1027 adults who were interviewed and the sample is adult U.S. residents.
B.The population is adult U.S. residents and the sample is the 1027 adults who were interviewed.
C.The population is adult U.S. residents and the sample is all those who responded "frequently".
D.The population is the 1027 adults who were interviewed and the sample is those who responded "frequently".

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