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State NAEP Sampling and Participation Rate

In state assessments (mathematics, reading, science, and writing), a sample of schools and students is selected to represent each participating state. In an average state, 2,500 students in approximately 100 public schools are assessed per grade, for each subject assessed. The selection process for schools uses stratified random sampling within categories of schools with similar characteristics. Some schools or groups of schools (districts) may be selected for each assessment cycle if they are unique in the state.

Typically, 30 students per grade per subject are selected randomly in each school. Some of the students who are randomly selected may be classified as students with disabilities (SD) or as English language learners (ELL).