（英语）统计学证明问题
you demonstrated that for the two-group permutation test,the same p-value resulted,regardless of whether the difference in means or the mean of one of the samples was used as the test statistic.Prove that this is true in general,i.e.,that using the mean of one sample as test statistic must yield the same p-value as using the mean difference
我题目意思并不完全了解,也不知道应该怎么证明,