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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 of probable error
1805-15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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probable-error in Science
probable error
The amount by which the arithmetic mean of a sample is expected to vary because of chance alone.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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