Is the IQ stats supported?
Repeatedly . Google “the bell curve.”
And for bonus points to make Arab heads explode, Google Ashkenazi IQ
Can of worms. The book "The Bell Curve" by by Richard Herrnstein and Charles Murray is seriously politically incorrect, and so various leftist "scientists" have tried to "correct" it. Who knows, maybe some of their claims are true.
FWIW I tend to believe Charles Murray and to distrust everyone else.
Here is Wikipedia's entry on Race and intelligence: