<p>Caltech may not think they are practicing AA, but if they accept women at twice the rate as men they probably are - even if it’s not formalized. All else being equal I think the woman gets the tip. I don’t blame them - even if they did accept the girl from my son’s class and not my son. 
A similar thing happens at MIT. And for what it’s worth, MIT has found that women were succeeding at MIT at the same level as men, even when their scores were somewhat lower.</p>