Mathematics, 20.01.2022 22:50 sindy35111

A study is being done on a group of people to decide the harm of fast food to the body. The
patients have their own choice on whether or
not they choose to eat the food and the doctors
just observe the results. What type of sample or
survey is this?
A. observational study
B. self-selected
C. controlled experiment

A study is being done on a group of people to

decide the harm of fast food to the body. The
patie

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