Last week, we wrote about an analysis of the newly released standardized test scores that offered some evidence of a widening gap in the Hartford area between historically high-performing school districts and those that have traditionally had below-average scores.
We’ve now expanded that analysis to all school districts in the state, and have found the same general trend: For most subject and grade groupings, school districts that exceeded the statewide average on a key measure of achievement in 2013, reported scores on the 2015 test that were even farther above the state average. Likewise, schools with below-average performance generally lost ground, falling farther below the statewide average.
In elementary school math, for example, among the 20 highest-performing districts two years ago, 18 had scores this year that were farther above the state average. Among the 20 lowest-performing districts two years ago, 16 dropped farther below the average.
Put another way, the above-average districts in 2013 outperformed the state by an average of 16 percent, while the below-average districts lagged the statewide figures by an average of 11 percent. But in 2015, the higher performing schools had widened their margin to 29 percent above the state average, while the lower-performing schools had dropped to 25 percent below the state average.
That’s what the numbers show. Divining what the numbers mean is a far harder task. Continue reading