The Associated Press-CNBC Poll on becoming a millionaire was conducted in the United States, U.K. and Australia.
The poll in the United States was conducted by GfK Roper Public Affairs & Corporate Communications from Aug. 18-22. It is based on landline and cellphone telephone interviews with a nationally representative random sample of 1,000 adults. Interviews were conducted with 700 respondents on landline telephones and 300 on cellular phones.
The AP-CNBC Poll of the U.K. was conducted Aug. 26-28 and Sept. 9-11 via GfK NOP Consumer's weekly omnibus survey. The August interviews are based on landline interviews with 1,000 adults age 16 and over in England, Wales, Scotland and Northern Ireland. The September interviews include 1,006 different adults age 16 and over in the same countries.
The AP-CNBC Poll in Australia was conducted Aug. 26-28 and Sept. 13-15 via an Australian national telephone omnibus survey overseen by GfK Roper Public Affairs and Corporate Communications. It is based on 1,000 landline interviews age 18 and over. The September interviews were re-interviews of 699 of the original respondents. Broad age quotas were applied to the sample and interviews were split between males and females within each geographical area.
For the U.S. poll, interviews were conducted in both English and Spanish. Interviews were conducted in English for the U.K. and Australia polls.
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, U.S. poll weighting took into account patterns of phone use _ landline only, cell only and both types _ by region.
No more than one time in 20 should chance variations in the sample cause the results to vary by more than plus or minus 4.1 percentage points from the answers that would be obtained if all adults in the U.S. were polled. The margin of sampling error for the U.K. poll was plus or minus 3.4 percentage points and plus or minus 3.8 percentage points for the poll in Australia.
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.