Race and IQs

[Anomalocaris]

No, Anom has it right.  The null hypothesis is just the default counterpoint to any assertion/hypothesis being tested.  To prove an assertion/hypothesis you would have to show the null hypothesis to be incorrect.  

"Smoking causes cancer" ->  a claim.  The null hypothesis would be "Smoking does NOT cause cancer."  Through all the medical and scientific testing we've done, the null hypothesis was proven incorrect, and we know that smoking is a cause of cancer.

Using your example, isn't "There is a difference in IQ between races" a claim?  And the null is "There is no difference in IQ between races" ?

Yes. But the null hypothesis still depends on the claim.

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Entire race?

Where does one race end and another begin?

Dr Philippe Rushton says that race is more than skin deep. You can tell a person's race even from their bone or DNA. That proves that race is a meaningful concept, not just a social construct.

That doesn’t answer my question.

It is possible to say the Pacific Ocean and Indian oceans are different, but where you chose to demarcate one from the other can still greatly effect their average traits.