You have another quiz, this time to see if you can deduce what school Michelle Rhee performed her Baltimore CTBS mathematics miracle in. As I have pointed out in previous posts, Rhee claims that she took her students from the 13th percentile (extremely low) to above the 90th percentile (you can’t go higher than 99th percentile) on national standardized tests in “academics” – so that, presumably, includes mathematics.

I randomly chose 5 of the seven Tesseract/EAI/Edison schools, and also five of the eight comparison-group regular public schools. For each school, I converted the NCE scores to percentile ranks for the 2nd grade in years 1992, 1993, and 1994, and for the 3rd grade in 1995. Finally, I again used a random-number generator to scramble up the order of the schools.

So, you have two challenges:

- In which of schools J-S did Michelle Rhee work this miracle? (Remember, there were only two third grade sections during her final year teaching, and she was team teaching [perhaps with the other third-grade teacher] so the jump should be extreme!)
- Which ones were regular public schools, and which ones were run by the for-profit EAI/Tesseract/Edison corporation? (Five are in one group, and five in the other.)

Here is the data (which I double-checked this time):

Small technical note: you cannot add, subtract, divide, multiply or take averages on percentiles. You can do all of that with NCEs, but NCEs are a lot harder to understand for most people than percentiles are. Rhee gave her results in terms of percentiles, so I am following suit.

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fist choice – school O, because it follows a similar pattern to the reading scores.

Second choice – School P, because the scores are in the same range as the Harlem Park reading scores.

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I don’t feel competent to say anything except that all the bar graphs show that Rhee is a liar, since none of them show the increases she claims.

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That’s the correct answer!

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[…] prompts below for access to Baltimore Sun stories for every game in Ravens history. … Now a Quiz on the Baltimore Rhee CTBS Math Miracle … – gfbrandenburg.wordpress.com 01/28/2011 You have another quiz, this time to see if you can […]

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Oh, thank you Guy.

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Guy, love your analysis. I would love to see a breakdown of data for those rated highly-effective on IMPACT. Specifically in terms of class size, sped. and ESL populations, etc. I doubt the information is readily available, but it’d be an excellent blog post if you could get your hands on it!

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