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NAEP Sample Design → NAEP 2005 Sample Design → National Assessment Sample Design

NAEP Technical DocumentationNational Assessment Sample Design

			Fourth- and Eighth-Grade Public School Reading and Mathematics Assessment Fourth- and Eighth-Grade Public School Science and Science Bridge Study Twelfth-Grade Public School Reading, Mathematics, Science, Science Bridge Study Fourth-, Eighth-, and Twelfth-Grade Private School Reading, Mathematics, Science, Science Bridge Study

The 2005 national assessment included four components:

• reading and mathematics assessments of fourth- and eighth-grade students in public schools,

• science and science bridge studies of fourth- and eighth-grade students in public schools,

• reading, mathematics, science, and science bridge studies of twelfth-grade students in public schools, and

• reading, mathematics, science, and science bridge studies of fourth-, eighth-, and twelfth-grade students in private schools.

The sample was designed to achieve a nationally representative sample of students in the defined populations who were enrolled at the time of assessment. The selected samples were based on a two-stage sample design:

• selection of schools within strata, and
• selection of students within schools.

The first-stage samples of schools were selected with probability proportional to a measure of size based on the estimated grade-specific enrollment in the schools.

For the reading and mathematics assessments in fourth- and eighth-grade public schools, the samples were the state assessment samples for each jurisdiction. The science assessment for fourth- and eighth-grade public schools were also the samples from the state assessment, with a supplemental sample drawn to represent the eight jurisdictions that did not participate in the science assessment at the state level.

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