How useful are IQ tests in determining how smart someone is?
How useful are IQ tests in determining how smart someone is?
user
That depends on how the test is written, who is writing the test, and how that test is used.  For instance, a test called “Freud’s intelligence test” was used to create IQ scores in the United States up until the 1970’s, which put a lot of people who now would have high IQs at a low IQ level, even though those people were really smart.  For instance, Stephen Hawking, who has a genius IQ, was originally given an IQ of 71 by this test.  On the other hand, modern IQ tests, which look at the same amount of information as the “Freud’s test”, but in a way that doesn’t lump so many smart people together in one category, usually test more highly.  For instance, a lot of highly successful CEOs have an IQ between 140 and 150, or about 3 standard deviations above the mean.  So you might want to look into what specific IQ test is used, if you want to get a good estimate of how smart someone is.  Here is a page where you can look up IQ scores of famous people, which will show you which IQ test they are using:
assistant
I see. So why do some people say that IQ tests don't really mean much when it comes to intelligence?
user