Source: 2007 Ad Tracking Study. The survey results are based on 1216 online interviews with a national random sample of adults (ages 25-54)who are equal decision makers and who have 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 1216 respondents with a margin of error of +/-2.4% at 90% confidence level. The study was conducted between February 19th - October 7nd, 2007 by Millward Brown, a leading global market research organization.