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Originally published Wednesday, January 16, 2013 at 12:05 AM

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How the AP-GfK poll on gun control was conducted

The Associated Press-GfK poll on gun control was conducted by GfK Roper Public Affairs & Corporate Communications from Jan. 10-14. It is based on landline telephone and cellphone interviews with a nationally representative random sample of 1,004 adults. Interviews were conducted with 604 respondents on landline telephones and 400 on cellular telephones.

The Associated Press

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The Associated Press-GfK poll on gun control was conducted by GfK Roper Public Affairs & Corporate Communications from Jan. 10-14. It is based on landline telephone and cellphone interviews with a nationally representative random sample of 1,004 adults. Interviews were conducted with 604 respondents on landline telephones and 400 on cellular telephones.

Digits in the phone numbers dialed were generated randomly to reach households with unlisted and listed landline and cellphone numbers.

Interviews were conducted in both English and Spanish.

As is done routinely in surveys, results were weighted, or adjusted, to ensure that responses accurately reflect the population's makeup by factors such as age, sex, education and race. In addition, the weighting took into account patterns of phone use - landline only, cell only and both types - by region.

No more than 1 time in 20 should chance variations in the sample cause the results to vary by more than plus or minus 4.0 percentage points from the answers that would be obtained if all adults in the U.S. were polled.

There are other sources of potential error in polls, including the wording and order of questions.

The questions and results are available at http://www.ap-gfkpoll.com.

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