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Suppose you are a home gardener interested in determining which fertilizer treatment works better to obtain more tomatoes from the plants in your backyard. You want to examine the effects of organic compost compared to commercial (non-organic) fertilizer purchased from the local hardware store.

Which of the following aspects of experimental design represents a good negative control?

A

All plants should have equal exposure to sunlight.

B

You must water them all the same amount regularly.

C

You must use the same variety of tomatoes for all treatments.

D

You must include some plants treated without fertilizer.

E

You must use a consistent amount of fertilizer for each treatment.

F

You must include some plants treated with both compost and commercial fertilizer.

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