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Fairfax County Public Schools (FCPS)
Reply to "APS - Percentage of 2nd/4th Graders w/ Very High (95%+) NNAT/CogAT Scores?"
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[quote=Anonymous][quote=Anonymous]is it possible that 95%-tile actually ranks them below avg in APS???[/quote] No. not even close. The 50th percentile is exactly the midpoint (actually median, not average, but the same in a bell curve distribution). The score for the NNAT is for all kids everywhere who take the test. Many believe it's possible that the the average/median here in Nova is higher due to the above average incomes and education documented here. In fact, on the CoGat, there is a separate stacking for fairfax and you can compute easily that the mid-point is about 3.5-6 points higher than the entire pool in FFX (APS may differ slightly not not likely drastically) It is somewhat reasonable therefore to say that the 55th percentile is average (locally). But people saying the 95th percentile is average are really not good at math. [/quote]
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