在过程能力分析中通常采用子样级差或样本总体标准差来估计总体标准差。
The standard deviation in Process Capability Index(PCI) is estimated by using the subgroup ranges or the sample standard deviation.
然后，通过实例的考查，间接地估算了样本总体的相对标准差。
Then the relative standard difference is estimated indirectly from the research of the examples.
给出了正态总体均值和标准差的最大似然估计（M LE），似然比检验统计量及其渐近分布等结果。
The maximum likelihood estimators(MLE) of means and standard deviations, and the asymptotic distribution of likelihood ratio statistic were given.
本研究试图通过计算平均数和标准差探究部分中国英语专业大学生词汇学习观念和策略的总体使用情况；
The present study attempts to explore the overall pattern of English vocabulary learning beliefs and strategies adopted by some Chinese English majors.
本研究试图通过计算平均数和标准差探究部分中国英语专业大学生词汇学习观念和策略的总体使用情况；
The present study attempts to explore the overall pattern of English vocabulary learning beliefs and strategies adopted by some Chinese English majors.
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