The Associated Press-NORC Center for Public Affairs Research poll on long-term care was conducted from March 13 to April 23 by NORC at the University of Chicago.
It is based on landline and cellular telephone interviews with a nationally representative random sample of 1,419 adults age 40 or older, including 458 Hispanics. Interviews included 1,014 respondents on landline telephones and 405 on cellphones.
Digits in the phone numbers dialed were generated randomly to reach households with unlisted and listed landline and cellphone numbers.
Interviews were conducted in both English and Spanish.
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 — 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 3.6 percentage points from the answers that would be obtained if all adults in the U.S. were polled. The margin of sampling error is plus or minus 6.8 percentage points for Hispanics.
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.