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The distinction between error and uncertainty is that error

  • A.is the bound on the difference, while uncertainty is the difference itself
  • B.applies to analogue instruments and uncertainty to digital ones
  • C.is a random quantity while uncertainty is always systematic
  • D.is the unknown difference from the truth, while uncertainty bounds it

Answer: D

The error of a particular measurement is a definite but unknowable number, and the uncertainty is the interval within which it is believed to lie. Modern practice reports the second because the first cannot be known, and confusing them leads to statements that cannot be checked.

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