Efficiency of a design in CRD.
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CRD is appropriate only for experiments with homogeneous experimental units, such as laboratory experiments, where environmental effects are relatively easy to control. ... Assign the treatments to the experimental plots randomly using a table of random numbers as follows.
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The estimated relative efficiency of the RCBD vs. CRD is given by the following formula
Thus for Example 1 of Randomized Complete Block Design
This means that the sample size for a CRD needs to be about 3 times the requirement for a RCBD design.
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