Determine whether a study is observational or an experiment and appropriate use cases

Question

A farmer divided hisland into2

groups of sections randomly. There is no difference in the quality of the soil between the2

groups of land. He used Type A seeds in the first group and Type B seeds in the second group. After3

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?

Select the correct answer below:

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.