Results for the survey are based on telephone interviews conducted under the direction of Princeton Survey Research Associates among a nationwide sample of 1,200 adults, 18 years of age or older, during the period September 13-17, 2001. For results based on the total sample, one can say with 95% confidence that the error attributable to sampling and other random effects is plus or minus 3.5 percentage points. For questions asked only during the field period of September 14-17 (N=868), the sampling error is plus or minus 4 percentage points. For results based on either Form 1 (N=416) or Form 2 (N=452), the sampling error is plus or minus 5.5 percentage points. For results based on the parents of children aged 5-12 (N=331), one can say with 95% confidence that the error attributable to sampling and other random effects is plus or minus 6 percentage points.<\/p>\n\n
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.<\/p>","protected":false},"excerpt":{"rendered":"
Results for the survey are based on telephone interviews conducted under the direction of Princeton Survey Research Associates among a nationwide sample of 1,200 adults, 18 years of age or older, during the period September 13-17, 2001. For results based on the total sample, one can say with 95% confidence that the error attributable to 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