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Fairfax County Public Schools (FCPS)
Reply to "Can I ask one question about the Fairfax GT testing without getting slammed?"
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[quote=Anonymous]For most ability/intelligent tests, 2 standard deviations (SD) above mean is the lower end of gifted population. It's about 97.7% percentile. The normal mean is 100, NNAT (50-150) and Cogat have SD 15, NNAT 2 (40-160) has SD 16. So 132 of NNAT2 is equivalent to 130 of NNAT, top 2%. This standard was not invented by FCPS, it is commonly used to identify gifted kids. Different states/districts have their own criteria for GT selection, from 88%-98%. FCPS uses 98%, that should be in the high end for GT program. +-3SD (sigma) covers 99.72%, so 3SD above the mean is ranking for 99.86%. They are very rare tails. [/quote]
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