The New 70/30 Rule: 70% Will Get Us $72 Trillion

By Betsy Hill and Roger Stark In Part One of this series, we envisioned a world where vastly greater numbers of students could improve their cognitive skills so that they score at the 70th percentile or higher.  Why the 70th percentile? Because students who perform at the 70th percentile and above generally can learn what they need to without adjustments to the curriculum and instruction. Scores on tests like the CogAT or CCAT that are predictive of academic performance are used for this purpose (among others). Of course, for any population, only 30 percent can perform in the top 30 […]

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