“…In comparison, the Tennessee STAR experiment sizes ranged from .11 to .20 (Nye, Hedges, & Konstantopoulos, 1999). What puts into context the effect sizes that we find, however, is that school districts may be able to attract more certified teachers by thinking smarter: increasing partnerships with universities, speeding up hiring timelines, cultivating recruits, and opening their doors to student teachers who may decide to remain in the district for a career (Roellke & Rice, 2007;Rutledge, Harris, Ingle, & Teresita, 2007). Finally, the school-level variable for the percentage of students receiving free or reduced price lunch was also a statistically significant predictor of mathematics gains, with students at lower-income schools predicted to make weaker gains.…”