While I do think the variance ratio in math is significantly different from unity (without speculating as to the cause), it's worth pointing out that while this does explain a lot of the gender imbalance in math, it doesn't come close in computing. Off the top of my head, in math it's something like 35% women, a 1:2 ratio, whereas in tech it's closer to 10%, or 1:9.
To explain a gap that wide based on variance, we'd have to assume that men are way more than 10% more variable in computer ability than women, probably more on the order of 100%, and that seems very unlikely to me (there's not really any data to look at there because CS performance is not as commonly measured as math is).
While I do think the variance ratio in math is significantly different from unity (without speculating as to the cause), it's worth pointing out that while this does explain a lot of the gender imbalance in math, it doesn't come close in computing. Off the top of my head, in math it's something like 35% women, a 1:2 ratio, whereas in tech it's closer to 10%, or 1:9.
To explain a gap that wide based on variance, we'd have to assume that men are way more than 10% more variable in computer ability than women, probably more on the order of 100%, and that seems very unlikely to me (there's not really any data to look at there because CS performance is not as commonly measured as math is).