问题如下图：
选项：
A. 
B. 
C. 
解释：
NO.PZ2015120604000150问题如下Evelyn Smith is stuing about the relationship of the χ2-stribution anthe F-stribution. Whiof the following conclusion is most appropriate?A.Both of their variances are smaller ththeir means.B.Both of them are symmetrical.C.Both of them cnot negative.C is correct.The F-stribution anthe χ2-stribution are positive anthey are asymmetical. There is no solirelationship between the means anvariances of this two stributions.老师，请问A为什么不对？
NO.PZ2015120604000150 问题如下 Evelyn Smith is stuing about the relationship of the χ2-stribution anthe F-stribution. Whiof the following conclusion is most appropriate? A.Both of their variances are smaller ththeir means. B.Both of them are symmetrical. C.Both of them cnot negative. C is correct.The F-stribution anthe χ2-stribution are positive anthey are asymmetical. There is no solirelationship between the means anvariances of this two stributions. chi square和F都是asymmetric
NO.PZ2015120604000150 课件表格不是说的assumptions 下面都是normally stributepopulation，正态分布不是就是对称的吗
你好，有没有t2和X检验的图像，这样可以更容易记住这个结论
