Question

Suppose we are using a randomized block design to test various medical treatments, and we are using patients, who receive the treatments, to create blocks. True or False: We should ensure that the patients within a block are as similar as possible. Explain.

Answer 1

Above statement is True.

With a randomized block design, the experimenter divides subjects into subgroups called blocks, such that the variability within blocks is less than the variability between blocks. Then, subjects within each block are randomly assigned to treatment conditions. Compared to a completely randomized design, this design reduces variability within treatment conditions and potential confounding, producing a better estimate of treatment effects.

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