Survey Methods
For Gallup Daily tracking, Gallup interviews approximately 1,000
adults, aged 18 and older, each day the Gallup Job Creation Index
results are based on a random sample of approximately 550 current full-
and part-time employees each day.
National results for December are based on Gallup Daily tracking
interviews with 14,313 employees. For this sample, one can say with 95%
confidence that the maximum margin of sampling error is ±1 percentage
point. Federal government, state, and local results for December are
each based on interviews totaling more than 600 adults. For each of
these samples, the maximum margin of sampling error is ±5 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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