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

Name: If we first arrange test units into similar groups before assigning treatments to them, the test design we should use is the randomised block design.
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Randomised block design is used when test units are first grouped into blocks based on similarities before random assignment of treatments within each block.

If We First Arrange Test Units into Similar Groups Before