煤化工浓盐水对煤泥水沉降特性的影响
如果一个样本的抽样分布(sampling distribution)平均值等于总体参数
抽样标准mil-std-105e表 样本 普通检验单次抽样计划single sampling
重学statistics,cha7 sampling and sampling distribution_sample
sqrt(sample_size) # 绘制正态分布的pdf norm = scipy.stats.
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