B选项为什么错误？
问题如下图：
选项：
A. 
B. 
C. 
解释：
NO.PZ2017092702000121 It cstate\"not equto\" provithe alternative hypothesis is state\"equto.\" In a two-tailetest, it is rejectewhen evinsupports equality between the hypothesizevalue anpopulation parameter. A is correct. The null hypothesis is the hypothesis to teste The null hypothesis is consireto true unless the evinincates thit is false, in whicase the alternative hypothesis is accepte没看懂内容，谢谢
NO.PZ2017092702000121 为什么可以认为Ho是真的呢？更准确来说不应该是fail to reject吗？
B的是错在 Ha是要大于小于这样写吗？
A原假设不是我们想要拒绝的吗，就是我们认为是错的呀，为什么A是对的？C这里的假设值和总体参数指的是什么？样本均值和总体均值吗？没写明白呀
麻烦一下第三个
