问题如下图：
选项：
A. 
B. 
C. 
解释：
你好，如果我知道总体的结果我干嘛还需要假设检验，假设检验不就是为了知道样本是否正确么，所以答案不是应该选择B么？
NO.PZ2015120604000138 问题如下 The following table shows a set of ta usfor a statistictest.When concting a hypothesis test to tell whether the population meis equto 8.5, whiof the following alternative hypothesis is most appropriate? A.Hμ≠8.5 B.Hμ≠8.9 hours. C.Hμ 8.5. A is correct.A two-tailetest is usefor telling whether the population meis equto 8.5. 老师好，这题虽然选对，但没太理解。本题出现了总体和样本的相关数值，在答题的时候，尤其是对比总体和数值性质区别的时候有什么需要注意的结论吗？
NO.PZ2015120604000138问题如下 The following table shows a set of ta usfor a statistictest.When concting a hypothesis test to tell whether the population meis equto 8.5, whiof the following alternative hypothesis is most appropriate?A.Hμ≠8.5B.Hμ≠8.9 hours.C.Hμ 8.5.A is correct.A two-tailetest is usefor telling whether the population meis equto 8.5.感觉AC都对啊，题目也没说一定要双尾啊
NO.PZ2015120604000138问题如下The following table shows a set of ta usfor a statistictest.When concting a hypothesis test to tell whether the population meis equto 8.5, whiof the following alternative hypothesis is most appropriate?A.Hμ≠8.5B.Hμ≠8.9 hours.C.Hμ 8.5.A is correct.A two-tailetest is usefor telling whether the population meis equto 8.5.不是说背择假设是和题目一致的吗？题目是🟰，那A明显错误啊？
不是要把不希望出现的结果作为H0吗？那么希望检验的H0应该不等于8.5才对啊
