Question: The headline was based on a study in which a
The headline was based on a study in which a representative sample of over 400,000 adults in the United States was asked a series of questions, including level of education and on how many of the past 30 days they felt physically and emotionally healthy. Explain how each of the “difficulties and disasters in observational studies” (Section 5.5) applies to this study, if at all.
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