Mathematics, 12.11.2019 05:31, albattatasraap5wymy

Afarmer divided his piece of land into 2 equivalent groups and the quality of the soil is the same in both of these groups. he used fertilizers for the first group of land. he did not use fertilizers for the second group of land. at the end of the season, he measured the yield of the crops in these 2 groups. is the study observational or experimental? if it is an experiment, what is the controlled factor?

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Afarmer divided his piece of land into 2 equivalent groups and the quality of the soil is the same i...