They reported that standardized test scores increased in 78 percent of the schools, but they failed to indicate whether the increase in each school was statistically significant. (educationnext.org)
They found for every 11 conversational turns, a child's verbal test score increased by one point. (hechingerreport.org)
A 2012 study found that middle school students who started class an hour later than usual saw their standardized test scores increase over 2 percentile points in math on average. (huffingtonpost.com)