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Public Opinion Polling. I. Polling. A. Gallup Poll. I. Polling. A. Gallup Poll B. Random sampling. I. Polling. A. Gallup Poll B. Random sampling C. Random-digit dialing. I. Polling. A. Gallup Poll B. Random sampling C. Random-digit dialing D. Sampling error (margin of error).
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I. Polling A. Gallup Poll
I. Polling A. Gallup Poll B. Random sampling
I. Polling A. Gallup Poll B. Random sampling C. Random-digit dialing
I. Polling A. Gallup Poll B. Random sampling C. Random-digit dialing D. Sampling error (margin of error)
I. Polling A. Gallup Poll B. Random sampling C. Random-digit dialing D. Sampling error (margin of error) E. Wording and bias