I.Q. test

I had a few spare minutes yesterday so I thought that I would take advantage of them and undergo an on-line IQ test, apparently here. There were 25 questions, most of which involved completing series. Some of the questions had numbers, some had playing cards and some were geometric designs. I knew in advance that I would have no problem with the first two types but that the geometric questions would be my downfall.

Here's an example of such a question. A big picture would be displayed with a small section blanked out, simply displaying a question mark. Six different options for the answer were displayed. Obviously I chose the wrong one - see the explanation.

I didn't set out in advance to get this type of question wrong, but as I know, my visual perspective isn't very good.

I got 16 out of the 25 questions correct, or 64%. Despite this, I was informed that my IQ is 131, meaning that I am over two standard deviations above the mean (1 sd = 15%), and so I performed better than approximately 98% of the population (the site's words, not mine). Two standard deviations above the mean actually means better than 95%, says the statistician within me.

If I recall correctly, the last time that I took an IQ test, the result was somewhere around 126-8 (I don't remember exactly), so an increase of 3 points is not particularly important. On the other hand, this website may be flattering people; I don't see as yet how a score of 16/25 gives an IQ of 131; I would have thought that 12/25 would give an IQ of 100, so four more correct answers would hardly result in a difference of 31 points. Anyway, I'm not letting this result go to my head. 

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