The Associated Press poll on the situation in Syria was conducted by GfK Public Affairs & Corporate Communications from Sept. 6-8. It is based on landline telephone and cellphone interviews with a nationally representative random sample of 1,007 adults. Interviews were conducted with 705 respondents on landline telephones and 302 on cellphones.
Digits in the phone numbers dialed were generated randomly to reach households with unlisted and listed landline and cellphone numbers.
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, cellphone 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 3.7 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://surveys.ap.org .