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Completely Randomized Design

A completely randomized design is a type of Experimental Design where the experimental units are allocated to the treatments in a completely random fashion.

Suppose we wanted to compare four brands of washing powder and decide to carry out four replications for each brand.

We would prepare 16 apparently identical pieces of soiled cloth and allocate them to the powders at random. To do this we might take 16 slips of paper and mark them Brand 1#1 up to Brand 4#4. We would then mix the pieces of paper up in a hat and match a slip of paper drawn at random with a piece of cloth also drawn at random.

 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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