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Which of the following most improves the trustworthiness of a measurement?

  • A.A more expensive instrument from a well-known maker
  • B.Taking a very large number of repeated readings
  • C.A valid calibration traceable to a national standard
  • D.A display with a larger number of digits

Answer: C

Traceability is what connects a reading to the definition of the unit, and without it no amount of resolution or repetition establishes correctness. Repetition reduces the random component only, and extra digits may show nothing but noise.

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