Forrester conducted a face-to-face survey fielded in July and August 2011 of 6,032 individuals ages 16 to 75 in the top urban cities in Mexico (including Mexico City, Guadalajara, Monterrey, Puebla, Toluca, Tijuana, Torreó n, Leó n, Veracruz, and Mérida) and Brazil (including São Paulo, Rio de Janeiro, Recife, Porto Alegre, Belo Horizonte, Salvador, Curitiba, Brasilia, Ribeirão Preto, Presidente Prudente, São José dos Campos, and São José do Rio Preto). For results based on a randomly chosen sample of this size (N = 3,032 for Mexico; N = 3,000 for Brazil), there is 95% confidence that the results have a statistical precision of plus or minus 1.79% of what they would be if the entire urban population of individuals ages 16 to 75 had been surveyed. Forrester weighted the data by age, gender, and socioeconomic level (in Mexico, ABC+, C, and D+ levels are represented; in Brazil, AB1, B2, and C1C2 levels are represented). The survey sample size, when weighted, was 6,032. (Note: Weighted sample sizes can be different from the actual number of respondents to account for individuals generally underrepresented in survey data.) The survey was conducted through in-person interviews collected door-to-door using a multi-stage stratified random sample methodology by IBOPE.
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