The research shows that influence of sample variation coefficient on estimated accuracy should be considered.
研究表明，应考虑样本变差系数对估计精度的影响。
On the basis of statistical theory, the distribution probability of full graded concrete strength and the relation between the sample size and coefficient of variation are introduced.
运用统计学理论给出了全级配混凝土试件强度的概型分布，导出了试验样本容量与变异系数之间的关系式。
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