DescriptionForrester conducted a mail survey of 58,993 US and Canadian households and individuals age 18 and older fielded from February to March 2007. For results based on a randomly chosen sample of this size (N=58,993), there is 95% confidence that the results have a statistical precision of plus or minus 0.4% of what they would be if the entire adult population of North America households and individuals had been surveyed. Forrester weighted the US head of household respondent data by age, gender, household income, household size and composition, education level, region, and market size (combined statistical area). The weighting criteria for the US individual respondent data include all of the above with the education variable being slightly different and including employment status.The survey sample size, when weighted, was 51,500 North American respondents at household level and 58,125 North American respondents at the individual level. Note: Weighted sample sizes can be different from the actual number of respondents to account for individuals generally underrepresented in mail panels. The sample was drawn from members of TNS' panel, and respondents were motivated by a sweepstakes drawing. The sample provided by TNS is not a random sample. While individuals have been randomly sampled from TNS' panel for this particular survey, they have previously chosen to take part in the TNS panel.
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