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this graph very clearly states it’s only related to men and has nothing to do with women at all. the only thing it shows is that the majority of men have average intelligence and average testosterone levels. R2=0.19 value means only 19% of the variation in testosterone levels can be explained by IQ, leaving 81% unexplained. This is a very weak relationship, bordering on statistical noise.
I wonder why they chose IQ as the independent variable? Surely it would be the other way around.
The thing about very superficial analysis like this is you can just go fishing for correlations and come back with something meaningless but publishable.
That exploitation of the scientific system is not what’s happening here. This is naive maybe, but not malicious, and it seems valid and without unwanted motives.