ISO 13909-7:2025
ISO 13909-7:2025 Coal and coke - Mechanical sampling - Part 7: Methods for determining the precision of sampling, sample preparation and testing
standard byInternational Organization for Standardization , 07/01/2025
standard byInternational Organization for Standardization , 07/01/2025
This document defines methods for estimating overall precision and for deriving values for primary increment variance which can be used to modify the sampling scheme to change the precision. Methods for checking the variance of sample preparation and testing are also described.
u000bIn this document, formulae are developed which link the variables that contribute to overall sampling precision.