2004 Ad Tracking Study. The survey results are based on 1560 telephone interviews (via computer assisted program) with a national random sample of adults (ages 25-54) who have either bought or sold a home within the past two years or plan to purchase or sell a home within the next two years. Brand awareness questions are based on a sample of 1560 respondents with a margin of error of +/-2% at 90% confidence level. The study was conducted between January 11th - October 2nd, 2004 by Millward Brown, a leading global market research organization.