The survey in Mexico is part of the larger Spring 2012 Pew Global Attitudes survey conducted in 21 countries under the direction of Princeton Survey Research Associates International.
Results for the survey in Mexico are based on 1,200 face-to-face interviews conducted March 20 to April 2, 2012. The survey is representative of the country’s adult population. It uses a multi-stage cluster sample stratified by region and proportional to population size and urban/rural population. All interviews were conducted in Spanish.
The margin of sampling error is ±3.8 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.