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Forum Home > Program Management Professional (PgMP) > Difference between "Precision" & "Accuracy" with examples ?

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"Precision" is how close the measured values are to each other. Focus here is on "consistency"

"Accuracy" is how close a measured value is to the target (expected) value. Focus here is on "perfection"

For example: In Automobile industry when it comes to Quality assurance audits on the automobile tool manufcature they may have very stricter precision & accuracy targets in place. For example a tool size is expected to be 10 mm thickness. To pass the quality assurance for example out of 10 samples taken it should have an accuracy range of 9.995 - 10.005 with a precision value within .005

If the samples actual values measured are let's say as follows: 9.997, 10, 10, 10, 10.001, 10, 10, 10.002,10, 10.003 Then it may satisfy the accuracy range because all the samples are within the expected range but fails in precision because the 1st & the last sample has a higher level of difference (10.003 - 9.997 = 0.006). So audit outcome is considered to be failed due to not meeting the precision requirement.

February 3, 2015 at 4:21 AM Flag Quote & Reply

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