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DC Public and Public Charter Schools
Reply to "Walls test today"
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[quote=Anonymous][quote] The cutoff could just as easily be 200 as it is 250-255. Yield matters here. SWW has gone somewhere between 50-70 into the waitlist the last several years. But what is the point of all of this if they are admitting students who score a low 70% on the entrance exam? That's really low. [/quote] Let's do some statistical modeling here. Let's assume the distribution of grades is approximately normal (bell shaped distribution). I would argue that a reasonable lower bound on the grades is around 15 points (that would mean getting correct about one out of four questions, probably just random guessing at the answers would yield such a score). So the average score would be around 35 points and the standard deviation is about 6 points. A cutoff grade of 40 points would let pass about 20% of the students. If 1200 students took the test, that is about 240 students. A cutoff grade of 41 points would let pass about 16% of the students So, if the cutoff were increased by one point from 40 to 41, about 4% of the students would not have passed. If 1200 students took the test, that is about 48 students. In other words, to pass the top 200 students (instead of the top 250 students) would translate into raising the cutoff by one point (certainly not by several points). [/quote]
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