统计物性、化性参数的最小样本容量可定为20

The Minimum Size Sample of Statistical Physical or Chemical Parameters Should be Stipulated to be 20

本文分析了某些关于正态样本统计处理和解释的国家标准,认为物性、化性数据样本的最小容量可从目前规定的30降为20,并且根据若干数据样本实例,指出直方图并不能定性地反映它们的分布是否正态.

Based upon an analysis of statistical methods stipulated by national standard for data-processingof normal samples, it is considered that the minimum sample size of physical or chemical sample datashould be reduced from 30 (currently in force) to 20. According to many practical examples of sampling statistics, the histogram is unable qualitatively shows that whether the samples are normal or not.