A Gallup poll tracks obesity in the United States for the most and least obese metro areas in the United States. The poll, based on more than 200,000 responses between January and December of 2010, reported that certain chronic conditions are more prevalent in the most obese metro areas. The table that follows presents a summary of the findings.

a. Are we able to conclude from the Gallup poll that obesity causes a higher incidence of these conditions?
b. What is a possible variable other than obesity that may be associated with these chronic conditions?

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10 Most Obese 0Least Obese Metro AreasMetro Areas Diabetes High blood pressure High cholesterol Heart attack 14.6% 35.8% 28.5% 5.9% 8.5% 25.6% 24.1 % 34%