Discussion
Assertion (A): An instrument can be highly repeatable and yet inaccurate.
Reason (R): Repeatability concerns consistency while accuracy concerns agreement with the truth.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Repeatability measures the spread of successive readings of the same sample; accuracy measures agreement with the true value. An instrument with a systematic offset reproduces that offset faithfully every time, so it is precise and wrong - which is why calibration against a standard is a separate exercise from checking repeatability.
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