QUESTION 2
A farmer divided his piece of land into 4 equivalent groups. The quality of the soil is the same across the 4 groups of land. He planted the same crop in all 4 groups of land and recorded the yield of the crop in all 4 groups for a 4 week period. Is the study observational or experimental? If it is an experiment, what is the controlled factor?
Select the correct answer below:
- The study is an observational study.
- The study is an experiment. The controlled factor is the 4 week observation period.
- The study is an experiment. The controlled factor is the land.
- The study is an experiment. The controlled factor is the growth of the crops.
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