Unfortunately that is not the only question worth asking.

Let me turn this question around to help illustrate. Do you think there is a correlation between IQ and candidate quality? Any correlation, positive, negative?

Is that the ONLY QUESTION that determines whether IQ test results should be on a resume?

The fact of the matter is that sometimes more information causes people to make less accurate judgments. Overweighting of information of small use can lead to worse judgments.