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Discussion

A round-robin or intercomparison exercise between laboratories establishes

  • A.the true value of the quantity being circulated
  • B.the resolution of each laboratory's instruments
  • C.whether their results agree within their stated uncertainties
  • D.which laboratory has the most expensive instruments

Answer: C

Circulating one artefact and comparing the reported values against the claimed uncertainties reveals any laboratory whose confidence exceeds its performance. It is how accreditation bodies keep the whole traceability chain honest.

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