In March of 2020 the COVID-19 Pandemic changed the world in education as we knew it. Schools, along with businesses and public venues around the world shut their doors in order to attempt to slow the spread of the virus. Just because the brick-and-mortar buildings were being closed did not mean that schooling would stop. Teachers and students from…

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.…