We can define it in a couple of different ways depending on whether we're talking about sample mean or population mean.
我们有几种不同的方式去定义这个概念，取决于我们指的是，样本均值还是总体均值。
In this paper the method on T2 control chart, by which the sample mean vectors of several related quality characteristics are controlled simultaneously in a process, is introduced.
介绍了工序中同时控制多个相关质量特性均值向量的T2控制图方法。
In this paper the method on T2 control chart, by which the sample mean vectors of several related quality characteristics are controlled simultaneously in a process, is introduced.
介绍了工序中同时控制多个相关质量特性均值向量的T2控制图方法。
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