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Average, men have larger brains and on average men have higher IQs (2-4pts). Head size correlates with IQ approximately 40%, brain volume too, though less %. Ravens isn't more rigorous. It's a myth that it's a pure g test (correlates around 70%).
Current opinion on brain size/vol x intelligence is maybe r = .30 or so. I'd say the true value is probably somewhere between .25 and .45, depending on how the adjustments for measurement error works out and sampling issues. (Correlations are not percentages.)
Of course, this matter has little to do with our study since we didn't use any brain variables at all.
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