Suppose that a study used self-reported consumption of potato chips and overall health index score from self-reported

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Suppose that a study used self-reported consumption of potato chips and overall health index score from self-reported health measures to estimate how potato-chip consumption affected health. 

a. Why could there be reverse causality? 

b. Why could there be omitted-factors bias from spurious correlation? 

c. Why could there be bias from measurement error?

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