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[quote=Anonymous][quote=Anonymous][quote=Anonymous]If only 39,000 fifth graders in the entire country are scoring above 524 in math, and only 78,000 score above 520, do you not see how it is statistically impossible for 100 Fairfax kids to have a 564?

Tigermoms roam everywhere.   If using SD, back of the envelope calculation says there would be fewer than 1,000 kids scoring above a 536 in the ENTIRE country.  Yet Fairfax has 100 scoring 24 points HIGHER.

Egads.  Stop. Stop. Stop.[/quote]

First, the distribution of Iready scores is likely not normal and probably has a long, lumpy right tail, so you can't extrapolate the counts in the right tail using normal z-scores.

Second, FCPS has a lot of high-achieving kids compared to the rest of the country. As an example, out of 1.5 million seniors, 16,000 were national merit semifinalists.  238 of these semifinalists were from FCPS.  If you apply the same ratio to the 39,000 figure above, you might estimate that 580 fifth graders are scoring above 524.  [/quote]

I'm on your side, but using National Merit SF is a horrible example.  Every state takes the top 0.5% of scorers in their state, and every state has a different cutoff.  FCPS does have an abnormally large share of kids above the national merit commended cutoff, which is the same for all states.  [/quote]

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