probable-error

probable error

noun Statistics.
a quantity formerly used as a measure of variability: equal to 0.6745 times the standard deviation. A normally distributed population has half of its elements within one probable error of the mean.

Origin:
1805–15

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
probable error   (prŏb'ə-bəl)  Pronunciation Key 
The amount by which the arithmetic mean of a sample is expected to vary because of chance alone.
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