问题如下：
Here is a table shows a set of data which is subject to the normal distribution . Peter sets up a null hypothesis--- H0: μ=8.5. Which of the following critical values is most appropriate for the population mean if the confidence interval is 99%?
选项：
A. ±1.96
B. -2.58
C. ±2.58
解释：
C is correct.
At α/2 = 0.5%, the critical z-values are: ±zα/2 = ±z0.005 = ±2.58
Z分布考试有表格提供吗？
