Results for the survey are based on telephone interviews conducted under the direction of Princeton Survey Research Associates among a nationwide sample of 2,000 adults, 18 years of age or older, during the period September 4-11, 1997. 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 2 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 2,000 adults, 18 years of age or older, during the period September 4-11, 1997. For results based on the total sample, one can say with 95% confidence that the error attributable to 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