in non-parametric tests, either the distribution of the data is not known/confined or they were measured at different situations.
Under these assumption, signed rank tests are usually performed. In that case, mean rank (or median rank) should be tested and behavior similarly.

请问，如果用非参检验出两者具有显著性差异，A的均值高于B，但是A的中位数低于B，我应该用中位数还是均值呢？