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#2 (permalink) |
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Eager!
![]() Join Date: Aug 2006
Posts: 79
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Average = 465
SD= ~130 Excel: {=normdist(800,465,130,true)} Percentile ~0.996 about 4 in 1,000 This is assuming that the distribution is completely normal, but I have a feeling the test gets harder and far less than 4/1000 get an 800. |
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#4 (permalink) |
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Eager!
![]() Join Date: Dec 2007
Posts: 45
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OK, I just did some looking and came up with an approximation of ~600/275,000 which is ~1 in every 458 test takers...ouch.
Strange -- That's about the rarity I would have guessed for an 800. I suppose 730 (the lowest scaled score in the 99%ile) is roughly 1 in 100, but I wonder what the breakdown is as far as rarity goes from 730 on up. Not that it matters, but it is interesting. To reiterate what I've opined elsewhere, I don't think there's any difference at all in ability in the 99%ile from 730 to 800. Schools that value the verbal score seem to treat all such high score as the same...a 730 V puts a verbal IQ at roughly about 145+ (on a standard deviation of 15). An 800 might be around a 155 IQ, but the difference between a 145 verbal IQ and 155 verbal (if you buy that IQ is being measured by a few missed questions) is just statistical noise and other factors matter far more after hitting such a high threshold. |
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#5 (permalink) |
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Eager!
![]() Join Date: Aug 2006
Posts: 79
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Another source is the reports section on the powerprep. Look at the distribution graph, they give an actual # of test takers for each score. I'm just too lazy to add up all of the test takers to get the total but the info is there. I don't understand why they test up to such a high level on verbal but lower on quant. why not design the test so a "500" is the same percentile on each section?
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