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A farmer wants to compare three new crop varieties (A, B, C) on a sloped field where soil fertility increases from bottom to top. The farmer divides the field into 8 horizontal blocks (strips from bottom to top) and randomly assigns each variety to one plot within each block. What is the primary advantage of this blocking design?
A farmer wants to compare three new crop varieties (A, B, C) on a sloped field where soil fertility increases from bottom to top. The farmer divides the field into 8 horizontal blocks (strips from bottom to top) and randomly assigns each variety to one plot within each block. What is the primary advantage of this blocking design?