A farmer wants to compare the tastiness and juiciness of
tomatoes grown with three amounts of a new fertilizer: none,
half the recommended amount, and the full recommended amount.
The farmer allocates 6 tomato plants to receive each amount
of fertilizer, assigning them at random. If the tomato taster
does not know how the tomatoes have been treated, is the
experiment single or double-blind? How might the blinding be
improved further?
A. The farmer could randomly decide each day which level of fertilizer to apply to each tomato plant.
B. The farmer could have the fertilizer proportions pre-mixed and then apply them without knowing the amount of fertilizer being applied to each tomato.
C. The amount of fertilizer could be determined for each tomato plant before the farmer purchases them.
D. The experiment is already double-blind. The blinding cannot be improved further.