Experimental observations are only experience carefully planned in advance, and designed to form a secure basis of new knowledge.
Ronald FisherNo isolated experiment, however significant in itself, can suffice for the experimental demonstration of any natural phenomenon; for the "one chance in a million" will undoubtedly occur, with no less and no more than its appropriate frequency, however surprised we may be that it should occur to us.
Ronald FisherThe analysis of variance is not a mathematical theorem, but rather a convenient method of arranging the arithmetic.
Ronald Fisher