NO.PZ2015120604000142
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. Construct a confidence interval at 1% significance level.
选项:
A. (8.3227, 9.5763)
B. (7.6544, 8.5445)
C. (8.3227, 9.4773)
解释:
C is correct.
这题的原假设很有迷惑性,想问一下为什么假设检验时直接用2.58作为关键值判断拒绝域,而这里用X+/-2.58 6 计算置信区间?怎么区分这两个概念呢?在假设检验里置信区间是不是用不到?