Because Muslim Americans make up a very small percentage of the U.S. public, it is difficult to provide a reliable picture of their views and differences in survey design can crucially affect findings.
The Pew Research Center has been studying the challenge to survey research posed by the growing number of wireless-only households. Here's a summary of its latest findings.
The Facts behind the Design, Conduct and Analysis of a High-Profile Study
by Scott Keeter, Director of Survey Research, Pew Research Center
Republicans Divided About Role of Government - Democrats by Social and Personal Values