DescriptionForrester conducted a mail survey fielded in August and September 2009 of 5,212 US and Canadian households and individuals ages 18 and older. For results based on a randomly chosen sample of this size (N = 5,212), there is 95% confidence that the results have a statistical precision of plus or minus 1.4% of what they would be if the entire population of North American households and individuals ages 18 and older had been surveyed. Forrester weighted the US head of household 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 included all of the above with the addition of employment status. The survey sample size, when weighted, was 4,203 North American respondents at the household level and 5,212 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's panel, and respondents were motivated by a sweepstakes drawing. The sample provided by TNS is not a random sample. While individuals may have been randomly sampled from TNS's panel for this particular survey, they have previously chosen to take part in the TNS panel.
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