I suspect the average math undergrad is not as good a programmer as the average CS undergrad (but my sample is restricted to my college). However, if we count

I suspect the average math undergrad is not as good a programmer as the average CS undergrad (but my sample is restricted to my college). However, if we count only the maths majors who end up working as programmers then I believe there will be some significant self-selection. So if such a study were done I wouldn't be surprised if math and physics majors were found to be better than CS majors. In any case I'd agree with you that in that I would never blindly use that in a hiring process.