Another study. The exact same resume was sent out, just with male or female names.http://digitalcommons.usu.edu/advance/269/
"Both men and women were more likely to vote to hire a male job applicant than a female job applicant with an identical record. Similarly, both sexes reported that the male job applicant had done adequate teaching, research, and service experience compared to the female job applicant with an identical record."
So the bias exists against women even in women's minds. They've been trained by society to view women as less qualified.