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Counting calories

The following news article was on the BBC in July 2011.After reading the article, answer the questions below based on your understanding of research methods.Researchers quizzed customers before and after a law was passed in New York in 2008 forcing restaurants to display nutritional information. Researchers carried out cross-sectional surveys with more than 7,000 people in 2007 and another 8,500 in 2009 at 168 locations...

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