EXPERIMENTAL DESIGN
Statisticians have found three ways for coping with individual-to-individual and observer-to-observer variation:
Steps one and two are trickier than they appear at first glance. Do the phenomena under investigation depend upon the time of day, as with body temperature and the incidence of mitosis? Upon the day of the week, as with retail sales and the daily mail? Will the observations be affected by the sex of the observer? ...
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