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Discussion

Precision of an instrument describes

  • A.the range of input over which it can be used
  • B.how closely repeated readings of the same quantity agree
  • C.how close its reading is to the true value of the quantity
  • D.the smallest change in input it is able to detect

Answer: B

Correct answer: how closely repeated readings of the same quantity agree

Precision is about scatter alone and says nothing about correctness. An instrument can be very precise and quite wrong - a systematic offset repeats faithfully in every reading. Precision is what averaging improves; accuracy is what calibration establishes.

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