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Discussion

The standard deviation of a set of readings measures

  • A.their scatter about the mean
  • B.the difference between the mean and the true value
  • C.the smallest change the instrument could detect
  • D.the systematic error common to all of them

Answer: A

It says how much the readings disagree with one another, which is a statement about precision rather than accuracy. A small standard deviation with a large systematic error is a perfectly consistent set of wrong answers.

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