A study reported in the May 17, 2012 issue of The New England Journal of Medicine followed people for an average of 13 years and found that people who consumed two or more cups of coffee a day were less likely to die during the course of the study than those who drank no coffee.
a. Was this study a randomized experiment or an observational study?
b. Based on this study, can it be concluded that drinking coffee causes people to live longer?
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