The first approach to consider is what we might think of as the "zero case" (or "null hypothesis" to borrow from science, or "first principles" from philosophy) of XML document modification.

第一种可以考虑的方法是对XML文档修改使用“零案例”(或者从科学上说，是“空假设”，从哲学上说，是“第一法则”)。

youdao

In the case of this beer poll, the expected frequency under the null hypothesis is the following.

在这个啤酒欢迎度民意测验的示例中，在虚假设条件下的期望频率如下。

youdao

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.

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。

youdao