Mathematics, 21.03.2021 03:20 zel117

A group of health researchers followed a group of nurses in Chicago, and found that those who regularly got 7 or more hours of sleep had lower incidence of several types of cancer. Answer the following questions: Is this a study or an experiment? How do you know? Does this mean that a lack of sleep causes cancer? If yes, how do you know? If no, what is a possible lurking or confounding variable?

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