In a study to support drug discovery for patients with lung cancer, patients were divided into 3 groups based on the severity of the disease. Smoking and alcohol consumption habits were recorded for all 3 groups. Is this an example of an observational study or experimental study?
Select the correct answer below:
- The study is an experiment. The controlled factor is the smoking and alcohol consumption habits.
- The study is an experiment. The controlled factor is the severity of the disease.
- The study is an observational study.
- The study is an experiment. The controlled factor is whether or not the person has lung cancer.
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