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ASTM C802 – Standard Practice for Conducting an Interlaboratory Test Program to Determine the Precision of Test Methods for Construction Materials


This practice describes techniques for planning, conducting, and analyzing the results of an interlaboratory study (ILS) with the objective of developing the precision statement of a test method.

It is designed to be used in conjunction with Practice C670. The methods used in this standard are consistent with those in Practice E691.


coefficient of variation; components of variance; data consistency; interlaboratory study; multilaboratory precision; single-operator precision; standard deviation


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