Question: Regarding the example from the Well blog discussed at the end of the video, suppose that those who eat healthier also exercise and their exercise

Regarding the example from the Well blog discussed at the end of the video, suppose that those who eat healthier also exercise and their exercise makes them more alert during the day. In what direction is your estimate likely to be biased if you fail to control for exercise given the relationship described above? downward biased not biased upward biased cannot determine before looking at the estimates

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