​NAEP Technical Documentation2019 Twelfth-Grade Private School National Assessment

The twelfth-grade private school samples for the national assessments in mathematics, reading, and science were designed to produce nationally representative samples of students enrolled in grade twelve in private schools in the United States and to accommodate the administration of the assessments in two modes: digitally based assessment (DBA) on tablets and paper-based assessment (PBA) using paper and pencil. The target sample sizes of assessed students for the twelfth-grade public school samples are shown in the table below. Prior to sampling, the target sample sizes were adjusted upward to offset expected school and student attrition due to nonresponse and ineligibility.

Samples were selected using a two-stage probability-based design that involved selection of schools from within strata and selection of students within schools. The first-stage sample of schools was selected with probability proportional to a measure of size based on estimated grade-specific enrollment in the schools.

The sampling of students at the second-stage involved three steps: (1) sampling of students in the targeted grade (twelfth) from each sampled school, (2) assignment of assessment mode (DBA or PBA), and (3) assignment of assessment subject (mathematics, reading, or science) to the sampled students.

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