标准摘要
[中文适用范围]： 本文件定义了估算总体精密度的方法，以及用于推导初级增量方差值的方法，这些方差值可用于修改采样方案以改变精密度。文件中还描述了检查样品制备和测试方差的方法。在本文件中，推导出了一些公式，将影响总体采样精密度的变量联系起来。 [外文原描述]： 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. In this document, formulae are developed which link the variables that contribute to overall sampling precision.
英文名称Coal and coke — Mechanical sampling — Part 7: Methods for determining the precision of sampling, sample preparation and testing