I strongly suspect that a lot of the members of LessWrong have had a non-internet IQ test and will have entered their scores on the census. Those who also took the extra credit internet test and entered their scores to that as well could serve as a sample group for us to make just such an analysis.
Granted, we are likely a biased sample of the population (I suspect a median of somewhere around 125 for both tests), but data is data.
Survey taken: check! Account finally registered: check, please!
I was off by 50%ish on the two estimation questions, but I forgive myself Bayes’ age since I really know nothing about history in “space-of-time” context. The redwood tree on the other hand was a geometry problem for me, more than anything else, and I misjudged its incline by half a degree.