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If repetition of an experiment gives the same incorrect value each time which check would be most useful?

Answer and explanation

Correct answer: Check instrument calibration

A result that is repeated consistently but differs from the true value suggests a systematic error. Such an error may arise from incorrect calibration, a zero error, or an instrument fault, so checking instrument calibration is most useful. Taking an average can reduce random error, but it does not remove a systematic error in the same direction. Exam tip: for consistent but inaccurate readings, first consider systematic error and calibration.

Related tags

Instrument CalibrationSystematic ErrorExperimental ErrorMeasurement AccuracyRepeatabilityNature And Meaning Of ScienceExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary Science

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