[Mathematical methods of inference] literally have no content; long division can calculate miles per gallon, or it can calculate income per capita... The statistical tools of experimental psychology were borrowed from agronomy, where they were invented to gauge the effects of different fertilizers on crop yields. The tools work just fine in psychology, even though, as one psychological statistician wrote, "we do not deal in manure, at least not knowingly."
-- Steven Pinker, How The Mind Works