How the poll was conducted

September 27, 2011 - 3:30 AM

The Associated Press-MTV poll on digital abuse was conducted Aug. 18-31 and is based on interviews of 1,355 people, including 631 teens ages 14-17 and 724 adults ages 18-24.

The national survey was conducted online by Knowledge Networks of Palo Alto, Calif., under the direction and supervision of the AP's polling unit.

Knowledge Networks initially contacted people using traditional telephone and mail polling methods and followed with an online interview. People chosen for the study who had no Internet access were given it for free. With a probability basis and coverage of people who otherwise couldn't access the Internet, the Knowledge Networks online surveys are nationally representative.

Results were weighted, or adjusted, to reflect the target population by demographic factors such as age, sex, region, race and education.

No more than one time in 20 should chance variations in the sample cause the results to vary by more than plus or minus 3.8 percentage points from the answers that would be obtained if all people in the target age group 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 .