A farmer divided his land into 2 groups of sections randomly. There is no difference in the quality of the soil between the 2 groups of land. He used Type A seeds in the first group and Type B seeds in the second group. After 3 months, the heights of the crops are measured across the two groups of land sections. Is the study observational or experimental? If it is an experiment, what is the controlled factor?
- The study is an observational study.
- The study is an experiment. The controlled factor is the seed type.
- 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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