In the statistical theory of the design of experiments, blocking is the arranging of experimental units in groups (blocks) that are similar to one another. Typically, a blocking factor is a source of variability that is not of primary interest to the experimenter. An example of a blocking factor might be the sex of a patient; by blocking on sex, t...
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http://en.wikipedia.org/wiki/Randomized_block_design
(from the article `statistics`) ...would not affect the test for significant differences due to gasoline additive. In this revised experiment, each of the manufacturers is referred ...
Found on
http://www.britannica.com/eb/a-z/r/11
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