The IQ difference is so small, and what the tests capture (there may be kinds of intelligence not so easily captured, a similar problem to KPI selection in gene

The IQ difference is so small, and what the tests capture (there may be kinds of intelligence not so easily captured, a similar problem to KPI selection in general to model reality) and confounding factors such as boys historically culturally more encouraged to study, internal bias from expectations (giving up on a test because you think you are stupid), etc, the minor male advantage isn't very convincing to me.