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Methodology
Energy Pulse 2009 is based on a non-experimental, cross-sectional telephone survey research. The survey questionnaire was designed by the Shelton Group and contained fixed-response alternative questions, Likert scale questions and a few unstructured (open-ended) questions. Sample data (N=505) was collected August 15-28, 2009 using a random digit dialing telephone survey from the population including all U.S. households. A stratified random sampling method was used for this study. Demographic quotas were set for gender, age, race, region and educational attainment. Based on the U.S. Census 2007 American Community survey estimate of the total U.S. population age 18+ (224,964,254) the sample has a 95% confidence level and a +/- 4.36% confidence interval (margin of error). In other words, Shelton can be 95% certain that the attitudes and opinions found in this study would closely match those of the entire U.S. population to within +/- 4.36%.
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