Word: basic
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Dates: during 1900-1909
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...sources of error which are to be avoided in securing statistics. First, observation is not trustworthy; there must be reliable figures and they should cover a considerable space of time. Second, the distinction must be kept in mind between "average" and "arithmetical mean." Third, in dealing with percentages the basic numbers must be carefully considered. Fourth, there is great danger in the use of concomitants; that is, arguing that one thing results from another because it is contemporaneous...