Choose the best scientific design to test the question “Which soil type results in the highest yield of tomatoes: clay soil or sandy soil?”

To compare which soil produces the highest tomato yield, measure the number of tomatoes produced in each soil type. Using 10 plants per soil type gives a more reliable comparison than using only one plant, and comparing the averages accounts for differences among plants. Therefore, the best design is to compare the average number of tomatoes from 10 plants in clay soil with the average from 10 plants in sandy soil.

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