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.…

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.…

This policy brief draws on research and evaluations of efforts in Tennessee, California, and Wisconsin to describe different approaches to reducing class size in kindergarten through third grade. Tennessee implemented a randomized experiment to investigate the effectiveness of smaller classes; California used a statewide approach; and Wisconsin…

Cooperative office education students with disadvantaged backgrounds remained in school longer, performed better in school, raised their level of aspiration, and improved employment opportunities for minority groups when compared to disadvantaged students not enrolled in cooperative education. (DM)

A SUMMER PROGRAM IN THE DESIGN AND ANALYSIS OF EDUCATIONAL EXPERIMENTS WAS HELD AND ITS RESULTS REPORTED. EXPERIMENTAL DESIGN, STATISTICAL ANALYSIS, COMPUTER USAGE, PREPARATION OF RESEARCH PROPOSALS, SPECIAL TOPICS, AND INDEPENDENT STUDY WERE DISCUSSED. TO AID IN THE EVALUATION OF THE PROGRAM, EACH OF THE 30 PARTICIPANTS ANSWERED A QUESTIONNAIRE…