I am asked periodically for cites in support of the familiar claims that philosophy majors outperform others on standardized tests.  Philosopher Steve McKay at Sherbrooke kindly flagged two sources, courtesy of the Department of Philosophy at Indiana University-Purdue University Indianapolis:  how aspiring philosophers perform on the GRE (the Graduate Record Exam, required by most PhD programs in the US) and how they perform on the LSAT (the Law School Admissions Test, required by all U.S. and, I believe, all English-language Canadian law schools).  I suspect the LSAT result is dragged down by the fact that Philosophy is lumped in with Religion, which is almost always a rather different kind of major! 

Some of these impressive results, one suspects, must be credited to self-selection, but some surely reflect the intellectual rigor and demands of philosophical study.