Um, how CMU:SCS has a gender ratio higher than average is because they accept more women. In 2000 the acceptance rate for women was 39%, for men it was 9% [1].

This is completely boring, MIT could make it so its CS class was 100% women if it wanted to, and because loads of very intelligent people apply to MIT I am sure that class of 100% women would do well. But, this is not a tactic that your average school who struggles to get qualified applicants at all can utilize.

[1] https://www.cs.cmu.edu/~lblum/PAPERS/women_in_computer_scien...