The survey in Egypt is part of the larger Spring 2011 Pew Global Attitudes survey conducted in 22 countries and the Palestinian territories under the direction of Princeton Survey Research Associates International.
Results for the survey in Egypt are based on 1,000 face-to-face interviews conducted March 24 to April 7, 2011. The survey is representative of the country’s adult population. It uses a multi-stage cluster sample design stratified by governorates proportional to population size and urban/rural population; about 2% of the population that lives in Frontier governorates is excluded for security reasons. All interviews were conducted in Arabic.
The margin of sampling error is ±4.0 percentage points. For the results based on the full sample, one can say with 95% confidence that the error attributable to sampling and other random effects is plus or minus the margin of error. In addition to sampling error, one should bear in mind that question wording and practical difficulties in conducting surveys can introduce error or bias into the findings of opinion polls.