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...//www.cas.lancs.ac.uk/glossary_v1.1/nonparam.html#wsrt "The Wilcoxon Signed Ranks test does not require the assumption that the population is normally distributed. In many applications, this test is used in place of the one sample t-test<http://www.cas.lancs.ac.uk/glossary_v1.1/hyptest.html#1sampt>when the normality assumption is questionable. It is a more powerful alternative to the sign test, but does assume that the population probability distribution is symmetric." I wonder if wilcox.test( ) in R also assumes the symmetric pdf? I checked the sign test too. But "the sign *t...