Question

being The New York Times reported, "The upshot is that a one-hour, before-school exercise program does seem likely to improve young people's health and happiness, says Dr. Elsie Taveras, a professor at Harvard and head of general pediatrics at Massachusetts General Hospital... Select the wrong alternative: Example of confounding factor: kids who joined BOKS might already be living healthier lifestyle, which made them join BOKS in the first place. New York Times reported association and not causation. Since this is an observational study, there might have been confounding factors. BOKS program was a randomized controlled experiment This was an observational study, as participation in BOKS was optional

Answer 1

Option A is correct. People already living healthier lifestyles will be more likely to join BOKS.

It was an association,not a causation.So B is correct.

C is also correct because A mentions a confounding factor.

It was an observational study ,so not a randomized controlled experiment. So D is wrong.

E is also correct.

So answer is D.