William is participating along with a group of adolescents trying to lose weight.One of his assignments is to keep a diary of his food intake and the times that he eats daily.This can be considered an example of what type of research?

Question

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This is a case study as William is keeping a diary and providing information about his food intake and eating habits. It is not an experimental study as it does not involve manipulation of variables, ethnography as it does not involve observation of a group's culture, or survey research as it is not asking a large group of people to answer specific questions.

William Is Participating Along with a Group of Adolescents Trying