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Randomized Block Design

A method used in the Design of Experiments. Suppose we wanted to compare four brands of washing powder. We decide to carry out four replications for each brand. To make the test realistic we give four volunteers four clean handkerchiefs each; they are to use each for one day.

In a Completely Randomized Design we would allocate the handkerchiefs to powder at random, so that one powder might get one, two, three or even all four handkerchiefs from one person.

In a Randomized Block design we would block on the handkerchiefs. We would allocate one, and only one, handkerchief from each volunteer to each powder.

 The Design of Experiments is covered in the MiC Quality basic Design of Experiments course and Advanced Design of Experiments course. Try out our courses by taking the first module of the Primer in Statistics free of charge.
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