How the poll on baseball was conducted

How the poll on baseball was conducted

The AP-Knowledge Networks poll on baseball was conducted Sept. 14-21, 2009, and is based on interviews of 559 adults who said they are fairly or very interested in Major League Baseball.

The national survey was conducted online by Knowledge Networks of Menlo Park, Calif., under the direction and supervision of AP’s polling unit.

Knowledge Networks initially contacted people using traditional telephone and mail polling methods and followed with online interviews. 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 adult 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 results to vary more than plus or minus 4.1 percentage points from the answers that would have been obtained if all adults in the U.S. who are interested in Major League Baseball were surveyed.

There are other, potentially greater, sources of variability in surveys, including the wording and order of the questions.

The questions and results for this poll are available at surveys.ap.org.