IQ means Intelligence Quotient. Its supposed to be a number that reflects the „intelligence“ of an individual.
Problems: 1 there is no clear definition of “intelligence”.
2 IQ assumes that 100 is the average intelligence, so what is average? There have been no nation wide tests to establish an average
3. There is no standard for IQ-Tests, there are several methods. I made three tests, according to those I got an IQ from 105 to 128. So apart from probably being intelligent I am none the wiser for it
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Intelligence: like “Life”, there are dozens of different definitions. Do you need self-awareness for intelligence? Does education matter? Does cultural conditioning matter? Does accumulated knowledge matter? Or is all this crap and your intelligence is defined solely by the size of your brain and number of synapses? If so, at what age is intelligence or potential intelligence formed and defined?
Depending on how you answer those questions one can argue that people in developed nations are more intelligent, or black (or yellow, or white) people are more or less intelligent. Hell, you can even argue that the inhabitants of a country using Wechsler-tests are far more intelligent that those of a different country using Catell-Tests. Your argument with sander and victor only stems from your assumption that intelligence is not genetic and them not excluding that possibility (not approving of it or even take it as a given, just not denying that it could be possible). So… IQ has only meaning in certain contexts. Comparing a middle-aged white engineer with a 12-year old Japanese orphan using Wechsler doesn’t say a thing. Using the test on 5 different middle-aged engineers may lead to some insights, like how big is the difference and what are factors in their lifes, health, upbringing, education or other aspect that might explain the difference. It could be significant if 4 of those 5 had an IQ of 110 and one 130 and that the different one had been an orphan. Then again it might just be coincidence and you would have to make the same test with a million engineers to see if the results are statistically significant or not.
In my opinion too much stuff is extrapolated (or made up) from such abstract things like IQ-Tests and followup-studies. Depending on the definitions, the questions, the people you ask, you can get every answer you want. We live in the age of statistics and polls. They have their uses and, carefully evaluated and put into context, can point to a common denominator. But don’t take them as universal truths. Because if you do, then Fallout 3 must be a good game, sales prove it. Millions bought it and their IQ is 100 so they cant be stupid and clever people don’t buy stupid games do they?