[Taraz]

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David,

There is no way to say without knowing what Y is and the backgrounds of the people answering the survey.

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This is what I was trying to get at in the other thread. It depends on what kind of belief Y is.

I don't see why people think that a linear relationship between intelligence and believing in Y is indicative of Y's truth when the overall percentage of believers is still so low. It seems much more plausible that there would be a systematic bias of some sort unless Y is a very technical concept which requires a lot of background knowledge.