The survey from the Associated Press-NORC Center for Public Affairs Research and MTV on online bullying among teens and young adults was conducted from Sept. 27-Oct. 7 by the GfK Group. It was based on online interviews with 1,297 teens and young adults, including 489 teens ages 14-17 and 808 young adults ages 18-24 who are members of GfK's nationally representative KnowledgePanel.
The original sample was drawn from a panel of respondents recruited by phone or mail survey methods. GfK provides Internet access to panel recruits who don't have it. With a probability basis and coverage of people who otherwise couldn't access the Internet, online surveys using KnowledgePanel are nationally representative.
Interviews were conducted in English.
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, race, education and phone usage.
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 those ages 14 to 24 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.apnorc.org .