Statistics gets a bad rap for being intentionally misleading. Women feel that they are unfairly underrepresented in technical fields. I'll withhold my own opinions for the moment and offer a digestible article that covers both bases. This article on Science Daily gives a nice summary of an analysis conducted by the American Institute of Physics Statistical Research Center that uses basic stats to show that the bias may not be as clear-cut as we think.
American Institute of Physics (AIP). "All-male physics departments are not proof of bias against hiring women, analysis finds." ScienceDaily, 19 Jul. 2013. Web. 29 Nov. 2013.