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A gardener wants to determine which of two brands of fertilizer is best for the plants in a garden. Before using

one of the fertilizers on the entire garden, the gardener decides to conduct an experiment using 28 individual plants. Which of the two plans for randomly assigning the treatments should the gardener use? Explain


Plan A: Choose the 14 unhealthiest looking plants. Apply brand x fertilizer to all 14 of those plants. Apply brand Y fertilizer to the remaining 14 plants.


Plan B: choose 14 of the 28 plants at random. Apply brand x fertilizer to those 14 plants and Brand Y fertilizer to the remaining 14 plants.


a. Plan A, because the unhealthy plants need the fertilizer the most and should be treated first

b. plan B, because the sample of plants is randomly chosen

c. Plans A and B are equivalent because they both follow experimental design.

d. Plans A and B are both poorly designed because there are not enough plants to test.

e. The plans cannot be evaluated from the information given.

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