Contact: Sam Hurst
Statement on Methodology
RBI Strategies and Research conducted a telephone survey of 400 adults, aged 18 or over, in South Dakota on behalf of The Dakota Poll, Inc. (LLC?) . Interviews were conducted October 17 – October 21, 2010 by American Directions Group, a market research firm specializing in telephone survey interviewing. Respondents were randomly selected using a random digit dial telephone sample of landline telephones purchased from Survey Sampling International. Interviewers asked for the youngest available adult of a specified gender. The gender requested was determined by the final digit in the household telephone number reached by the interviewer.
Sample was weighted by age and race to more accurately reflect the 2009 American Community Survey.
The margin of error for a survey of 400 interviews is +/-4.9% at the 95% confidence level. The margin of error is higher for subsamples within the full sample. Other sources of error not accounted for by the stated statistical margin of error include, but are not limited to, question wording, question order, refusal to be interviewed, bias in landline only interviewing and demographic weighting.
Deputy Director of Research
RBI Strategies and Research
O – 303.832.2444
M – 720.878.5840