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How the AP-GfK poll was conducted

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The Associated Press-GfK poll on the assassination of John F. Kennedy was conducted by GfK Roper Public Affairs & Corporate Communications on April 11-15. It is based on landline telephone and cellphone interviews with a nationally representative random sample of 1,004 adults. Interviews were conducted with 601 respondents on landline telephones and 403 on cellular telephones. Digits in the...