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I think you're confusing measures X and correlates with X. Snowfall probably correlates very strongly with the number or people skiing on a weekend, but it does not measure the number of people skiing on a weekend.

Let's say you win this bet (which I wouldn't take since I never argued that was the case in the first place), all you have shown is that the ability to answer questions on an IQ test has a strong correlation with income. How does this have anything to do with intelligence, which the test claims to measure? If you where to say that "well this means that intelligence is strongly correlated with income" this is tautological since the IQ test is your only way to measure intelligence in the first place.

My assumption that IQ scores probably don't correlate that strongly to many things is based on the observation that we don't use it that much. If you look more thoroughly there are, as expected, obviously correlations between IQ and many things, but how strong those correlations are and the variance make many of them interesting but not fantastically useful.

Correlating with the extremes is not that interesting, now if you where to show that the is a strong correlation between IQ test percentile and income percentile across the board that would be interesting. If you're really interested there has been research into the correlation between IQ and Income and it's about 0.4-0.5 [1]

1. http://en.wikipedia.org/wiki/Intelligence_quotient#Income



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