检验工具还可用于当两个总体平均值之间的差异具有特定非零值的空值假设的情况。
The z-Test tool can also be used for the case where the null hypothesis is that there is a specific nonzero value for the difference between the two population means.
讨论了等距抽样中，如何利用辅助信息改进总体平均值的估计，以达到提高估计精度之目的。
This paper deals with the estimation of population mean in systematic sampling by use of auxiliary information in order to improve the accuracy of the estimate.
此工具用于检验两个总体平均值之间不存在差异的空值假设，而不是单方或双方的其他假设。
This tool is used to test the null hypothesis that there is no difference between two population means against either one-sided or two-sided alternative hypotheses.
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