Disclaimer

Released: August 11, 2009

Survey Methodology Likely Voters 07/31/09 thru 08/04/09

Zogby International was commissioned by National Wildlife Federation to conduct a telephone survey of likely voters.

The target sample is 1,005 interviews with approximately 25 questions asked. Samples are randomly drawn from telephone cd's 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, gender] is used to adjust for non-response.  The margin of error is +/- 3.2 percentage points. Margins of error are higher in sub-groups.

 

 

 

 

 

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