This Harris Poll was conducted online, in English, within the United States between November 11 and 16, 2015 among 2,223 adults (aged 18 and over). Figures for age, sex, race/ethnicity, education, region and household income were weighted where necessary to bring them into line with their actual proportions in the population. Propensity score weighting was also used to adjust for respondents’ propensity to be online.
All sample surveys and polls, whether or not they use probability sampling, are subject to multiple sources of error which are most often not possible to quantify or estimate, including sampling error, coverage error, error associated with nonresponse, error associated with question wording and response options, and post-survey weighting and adjustments. Therefore, The Harris Poll avoids the words “margin of error” as they are misleading. All that can be calculated are different possible sampling errors with different probabilities for pure, unweighted, random samples with 100% response rates. These are only theoretical because no published polls come close to this ideal.
Respondents for this survey were selected from among those who have agreed to participate in Harris Poll surveys. The data have been weighted to reflect the composition of the adult population. Because the sample is based on those who agreed to participate in our panel, no estimates of theoretical sampling error can be calculated.
These statements conform to the principles of disclosure of the National Council on Public Polls.
The results of this Harris Poll may not be used in advertising, marketing or promotion without the prior written permission of The Harris Poll.
Product and brand names are trademarks or registered trademarks of their respective owners.
The Harris Poll® #30, May 2, 2016
By Allyssa Birth, Senior Research Analyst, The Harris Poll