The purpose of this study was to examine teacher qualification factors believed to affect reading achievement of students with disabilities in intensive reading classes after controlling for certain student and teacher demographics using ANCOVA. Results indicated that there was no statistically significant difference between the reading…

Background: Cluster-randomized experiments that assign intact groups such as schools or school districts to treatment conditions are increasingly common in educational research. Such experiments are inherently multilevel designs whose sensitivity (statistical power and precision of estimates) depends on the variance decomposition across levels.…