9.5 Hypothesis Tests for One Population Mean When σ Is Known

使用z-test前提（同使用mean distribution之前的考虑）

在H0假设的同时需要说明significant level

Statistical Significance Versus Practical Significance：综合考虑使用sample 得到的mean和H0的mean，就实际意义来看，如果差不多则可以约等。

The Relation between Hypothesis Tests and Confidence Intervals：其联系在于σ，置信区间是 unreject region所在横坐标；p值是 reject region 所在区域面积

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