Question:

Poll Demographics

About this Poll

METHODOLOGY: The following key findings report summarizes data collected in a
telephone survey of 588 registered voters in Pennsylvania from February 9 to 17, 2007.
Individual households throughout the state were selected randomly for inclusion in the
study. To attain a larger sample of Democratic voters in order to measure preferences in
the Democratic Primary, an over sample of registered Democrats was included as part of
the sampling methodology. After 500 surveys were conducted among a random sample
of registered voters in the Commonwealth, an additional sample of Democrats was
gathered through a screening process. The actual number of Democratic voters used to
make estimates of voter preferences is 302. Estimates of the general voting population
are based on a weighted sample that includes all 588 individuals surveyed. The sample of
phone numbers used in the survey was generated by Genesys Sampling Systems of Ft.
Washington, PA. This number of completions for the entire sample results in a margin of
error of +/4.6%
at the 95% confidence interval. However the margin of error for
Democrats is +/5.6%
at the 95%, and the margin of error for all sub groups (i.e.
women, Republicans) is larger due to smaller sample size.