At Coral Reef Senior High, calculus teacher Orlando Sarduy understands complicated formulas, and knows he will be graded on how his students perform on tests. But despite his advanced knowledge of math, Sarduy cannot explain the statistics-packed formula behind the grade he’ll get, says the Hechinger Report. It is so confusing that even a member of the state committee tasked with developing it abstained from a vote because she didn’t understand it. The formula—in what is called a “value-added” model—tries to determine a teacher’s effect on a student’s FCAT performance by predicting what that student should score in a given...

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