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FreakonomicsBut if ten poor students gave correct answers to the last five questions on the exam (the hardest ones), thatБЂ™s worth looking into. Another red flag would be a strange pattern within any one studentБЂ™s examБЂ”such as getting the hard questions right while missing the easy onesБЂ”especially when measured against the thousands of students in other classrooms who scored similarly on the same test. Furthermore, the algorithm would seek out a classroom full of students who performed far better than their past scores would have predicted and who then went on to score significantly lower the following year. A dramatic one-year spike in test scores might initially be attributed to a good teacher; but with a dramatic fall to follow, thereБЂ™s a strong likelihood that the spike was brought about by artificial means. Consider now the answer strings from the students in two sixth-grade Chicago classrooms who took the identical math test. Each horizontal row represents one studentБЂ™s answers. The letter a, b, c, or d indicates a correct answer; a number indicates a wrong answer, with 1 corresponding to a, 2 corresponding to b, and so on ...» |
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