If we first arrange test units into similar groups before assigning treatments to them, the test design we should use is the randomized block design.

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Quizplus · Accepted Answer

The randomized block design is a test design where test units are first grouped based on their similarities and then treatments are assigned to these groups. This helps to decrease the variability among the test units and increase the precision of the experiment. Therefore, if we first arrange test units into similar groups, we should use the randomized block design.

If We First Arrange Test Units into Similar Groups Before