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Apparently it's a site that does IQ tests online. They decided to track results by which browser was used. They could then average results across all people who used any particular browser.
Unsurprisingly, the lowest average score belonged to IE 6, followed closely by IE 7. Then came IE 9, followed by IE 8. Perhaps the surprise there is that users of IE 8 actually scored higher than those of IE 9.
Meanwhile, all of the other browsers that they measure have people substantially above average. The top scorers are relatively obscure.
Now, the explanation for this is pretty simple. It's not that Internet Exploder makes you stupid. IQ isn't a perfect measure of how tech-savvy someone is, but they're fairly correlated. For what it's worth, online IQ tests aren't a perfect measure of IQ, either, but online IQ test results are also correlated with how tech-savvy people are.
And how tech-savvy someone is is very correlated with browser choice. People who know little to nothing about technology will have internet Exploder installed on their computer when they get it, and may not know that there are any other browsers out there. About 80% of people who scored in the bottom few percentage points were using some version of IE.
Meanwhile, people who are very tech-savvy are likely to know of several browsers. These are the only ones who make a meaningful choice. Opera, Camino, and IE with Chrome Frame aren't even a statistical blip at the bottom 20%, but all are meaningfully representated among people who score high.
Even so, obscure browsers tend to be obscure for a reason, and the people with high IQs aren't necessarily stampeding to them. Among people with the highest scores, Firefox was the most popular, then Chrome, even if you bundle IE 6, 7, 8, and 9 together as a single browser. With the IE versions separated, IE 8 came in third among top scorers, followed by Opera. Interestingly, IE 8 was more popular than all other versions of IE added together.
Does the study really mean anything? Perhaps that having a program installed when you get a computer has more influence on people who aren't very tech savvy, though you could have guessed that. But I still think it's interesting.
For what it's worth, the study doesn't really support the title of this thread. But a provocative title will get more people to click on it, so I went with it anyway.