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A gross error in a measurement arises from

  • A.unpredictable variations in the quantity or the environment
  • B.the instrument drawing power from the circuit it measures
  • C.human mistakes in reading or recording
  • D.a fault in the design or calibration of the instrument

Answer: C

Correct answer: human mistakes in reading or recording

Gross errors are blunders - misreading a scale, transposing digits, recording against the wrong entry, using the wrong range. They are not amenable to statistical treatment, since they are not small and not random, and the only defence is care and independent repetition by another observer.

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