[philh]

I think so. I've heard (and repeated) it many times, and I don't recall ever hearing it disputed. I'd be surprised and embarrassed if it was untrue.

https://en.wikipedia.org/wiki/Sex_differences_in_intelligenc... says it's controversial near the top. But the citation is a single paper which disagrees, and the rest of the article seems to support the hypothesis.

edit: removed "unpublished"

[hiq]

How can you tell it is not published? It seemed to me that it had been published in the American psychologist according to [1].

[1] https://www.ncbi.nlm.nih.gov/pubmed/16366817

[philh]

My bad. It looks like the link was to a pre-publication draft, but it has indeed since been published.

[xyzzyz]

Just FYI: many papers available onlines are actually preprints/drafts, because the researchers are much freer to distribute them, than the actual published papers bearing journal branding.