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APPENDIX
Survey Methodology
This is a nationwide telephone survey of adults conducted
by Zogby International. The target sample is 1,215 interviews
with approximately 47 questions asked. Samples are randomly
drawn from telephone CDs of national listed sample. Zogby
International surveys employ sampling strategies in which
selection probabilities are proportional to population size
within area codes and exchanges. Up to six calls are made
to reach a sampled phone number. Cooperation rates are calculated
using one of AAPOR’s approved methodologies[1]
and are comparable to other professional public-opinion surveys
conducted using similar sampling strategies.[2]
Weighting by region, party, age, race, religion, and gender
is used to adjust for non-response. The margin of error is
+/- 2.9 percentage points. Margins of error are higher in
sub-groups.
Zogby International’s sampling and weighting procedures also
have been validated through its political polling: more than
95% of the firm’s polls have come within 1% of actual election-day
outcomes.
The full polll results, including narrative analysis, may
be downloaded on line at http://www.manhattan-institute.org/energymyths/poll.pdf.
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1. See COOP4 (p.38) in Standard Definitions: Final Dispositions
of Case Codes and Outcome Rates of Surveys. The American
Association for Public Opinion Research, (2000).
2. Cooperation Tracking Study: April 2003 Update, Jane M.
Sheppard and Shelly Haas. The Council for Marketing &
Opinion
Research (CMOR). Cincinnati, Ohio (2003).
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