Teacher ratings vary widely among Boston public schools, with many ranking all their teachers either exemplary or proficient while others gave lower marks, according to data released Wednesday in response to a Globe challenge to obtain the public records. The disparity in ratings raises questions about whether schools that gave all higher marks truly have the most talented teachers or whether a low bar was set for performance. At the other end of the scale, a disproportionate share of black, Latino, and older teachers received low marks, prompting some to worry about a potential bias among evaluators at some schools.
