Posted by scooby9132002 on Sunday, May 10, 2009 at 4:50pm.
To assure high validity, reliability, and representativeness of the data, I suggest you survey shoppers in several grocery stores at different times of day and days of the week. Be sure to survey hundreds of people to get a fair sample.
This article should also help you.
http://en.wikipedia.org/wiki/Marketing_research
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