Candidates are tied on understanding the problems Americans face
Survey Methods
Results for swing state residents are based on telephone interviews from Jan. 24-28, 2012, in a USA Today/Gallup
poll conducted as part of Gallup Daily tracking with a random sample of
737 registered voters, aged 18 and older, living in Colorado, Florida,
Iowa, Michigan, Nevada, New Hampshire, New Mexico, North Carolina, Ohio,
Pennsylvania, Virginia, and Wisconsin, selected using random-digit-dial
sampling.
For results based on this sample, one can say with 95% confidence
that the maximum margin of sampling error is ±5 percentage points.
The data represent a subset of Gallup’s national daily tracking
survey for Jan. 24-28, and are proportionate to population size of each
state. Samples are weighted by gender, age, race, Hispanic ethnicity,
education, region, adults in the household, and phone status (cell
phone-only/landline only/both, cell phone mostly, and having an unlisted
landline number). Demographic weighting targets are based on the March
2011 Current Population Survey figures for the aged 18 and older
non-institutionalized population living in U.S. telephone households.
All reported margins of sampling error include the computed design
effects for weighting and sample design.
The weighted and unweighted sample sizes for each state are shown here:
Results for the national sample are based on telephone interviews from Jan. 27-28, 2012, in a USA Today/Gallup
poll conducted as part of Gallup Daily tracking, with a random sample
of 907 registered voters, aged 18 and older, living in all 50 U.S.
states and the District of Columbia.
For results based on this sample, one can say with 95% confidence
that the maximum margin of sampling error is ±4 percentage points.
Interviews are conducted with respondents on landline telephones and
cellular phones, with interviews conducted in Spanish for respondents
who are primarily Spanish-speaking. Each sample includes a minimum quota
of 400 cell phone respondents and 600 landline respondents per 1,000
national adults, with additional minimum quotas among landline
respondents by region. Landline telephone numbers are chosen at random
among listed telephone numbers. Cell phone numbers are selected using
random-digit-dial methods. Landline respondents are chosen at random
within each household on the basis of which member had the most recent
birthday.
Samples are weighted by gender, age, race, Hispanic ethnicity,
education, region, adults in the household, and phone status (cell phone
only/landline only/both, cell phone mostly, and having an unlisted
landline number). Demographic weighting targets are based on the March
2011 Current Population Survey figures for the aged 18 and older
non-institutionalized population living in U.S. telephone households.
All reported margins of sampling error include the computed design
effects for weighting and sample design.
In addition to sampling error, question wording and practical
difficulties in conducting surveys can introduce error or bias into the
findings of public opinion polls.
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