如果一个样本的抽样分布(sampling distribution)平均值等于总体参数
煤化工浓盐水对煤泥水沉降特性的影响
sqrt(sample_size) # 绘制正态分布的pdf norm = scipy.stats.
6_sample_and_sampling_distribution.
【求助】粒度分析图拟合
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