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In a study to identify the effectiveness ofdrugs in reducing smoking habits, the study participants were grouped into3 categories. Each of the groups wasassigned randomly

In a study to identify the effectiveness ofdrugs in reducing smoking habits, the study participants were grouped into3

categories. Each of the groups wasassigned randomly to one type of drug, either Drug A, Drug B, or Drug C. Results were observed for a4

week period. Is the study observational or experimental?If it is an experiment, what is the controlled factor?

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