The data in this Pew Research Center report is drawn from a national cross-sectional survey conducted by Westat. The sampling design of the survey was an address-based sampling (ABS) approach, ...
Survey methodology encompasses the systematic approach to designing, administering and analysing surveys to ensure reliable and valid data. Central to this discipline is the optimisation of response ...
Results for the survey are based on telephone interviews conducted under the direction of Gallup and Langer Research Associates. The results are based on national samples, unless otherwise noted. More ...
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