@Icon,
Icon;31741 wrote:let me simply state that there are 24 hours in a day and I use each one to the best of my ability.
As do we all.
And you're probably not going to do them very effectively on 2 hours of sleep a night, considering what's known about attention, memory, and learning among people who average less than 8. I know, I've been there, and there's a reason why trainees in my profession now have strictly regulated work hours.
As for why IQ matters, it is a way that schools can assess educational needs. Plain and simple. That's the only practical application of it that has any kind of validation. For academic purposes, it is useful in its attempt to standardize intelligence testing so as to understand how intelligence is distributed in the general population.
I mentioned that IQ is basically normally distributed, but there is a caveat to that. IQ is actually bimodal. There is a main peak around a population mean of 100, and it's overall normally distributed around it. But there is a second (much) smaller peak in the 30s and 40s. This represents the subpopulation of people with profound medical illness (i.e. severe mental retardation from various medical causes).
IQ is known to be affected by first language, literacy, education level sociocultural background. These are all independently associated with performance on the test, which means that it is NOT a pure test of intelligence. If it were a pure test of intelligence, then one's level of education should not matter. But education can indeed compensate for lack of intelligence on the IQ test. Furthermore, speed is a major component to IQ score. This means that two people with equal intelligence can score quite differently if one is faster (or luckier) than the other.