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Calibration QA sample size

Discussion in 'Sampling, Standards and Inspection' started by Ken Perrone, Jun 2, 2016.

  1. Ken Perrone

    Ken Perrone New Member

    Jun 2, 2016
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    Hello everyone. I am tasked with the inbound quality assurance on calibrations performed by 17025 accredited vendors for equipment used in our 17025 accredited labs. I am trying to determine the sample size to poll as a percentage of all inbound calibrations.

    We perform somewhere between 4 and 5 thousand vendor calibration operations a year. I do not know the amount of previous failure rate, but I am looking to achieve accuracy of 3% with 95% confidence.

    My background in statistics is somewhat limited, so I apologize if I am missing some information. What is the best way to statistically determine this (and why, so that I may learn).

    Thank you for the help in advance!