Experiments that assign intact groups to treatment conditions are increasingly common in social research. In educational research, the groups assigned are often schools. The design of group-randomized experiments requires knowledge of the intraclass correlation structure to compute statistical power and sample sizes required to achieve adequate…

Evaluation at the end of the first year of a 3-year project to use microcomputers to improve the reading and language skills of Limited English Proficient (LEP) Native American students revealed that the major objective was not reached, but there were achievements nonetheless. Lakota (Sioux) children constitute 10% of the Rapid City, South Dakota…

This report provides a summary for the years 1993 through 1997 of district and school-level results in Washington on the Comprehensive Tests of Basic Skills, fourth edition (CTBS/4) for grades 4 and 8 and the Curriculum Frameworks Assessment System (CFAS) for grade 11. For grades 4 and 8, the average national percentile scores in reading,…