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probable error

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noun Statistics.
  1. 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

First recorded in 1805–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
probable error in Science

probable error

[prŏbə-bəl]
  1. The amount by which the arithmetic mean of a sample is expected to vary because of chance alone.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.