Women don't have the same passion for open source men do? Really??

Not at all. You're looking at this in the wrong direction. If your null hypothesis is "U238 is an absolutely stable isotope" then you only need to see a single particle decay to disprove it. If your null hypothesis is "The relatively low proportion of women in open source communities is entirely because they are less interested in the first place" (ie, there's no active process in the community itself that excludes women) then verifiable anecdotal evidence is entirely sufficient to disprove the null hypothesis.

I'm not denying that your figures show that there are few women involved in free software or amateur radio. I'm just saying that it's impossible to deduce *why* there are few women involved from that information.