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The symbolic notation of statistics makes it possible to state and discuss statistical ideas more precisely and far more concisely than is ordinarily possible with common words. Mastering the notational symbols and the rules governing their applications may be time-consuming, but it is the price that must be paid for this superior mode of communication. Since mathematics provides the foundation of statistics, it is to be expected that many of the symbols and rules used in statistics will be those of mathematics. Others, however, are unique to statistics.