NAEP Technical DocumentationSample Design for the 2013 National Assessment

			Fourth- and Eighth-Grade Public School National Assessments Twelfth-Grade Public School National Assessment Private School National Assessment

The 2013 national assessment included mathematics and reading assessments in public and private schools at grades 4, 8, and 12.

The sample designs aimed to achieve nationally representative samples of students in the defined populations who were enrolled at the time of assessment.  

The samples were based on a two-stage sample design:

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

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

For fourth- and eighth-grade public schools, the NAEP state student samples and assessments constitute the NAEP national student samples and assessments.

For the twelfth-grade public schools, the national sample consisted of 13 state samples and an additional sample that represented the remaining 37 states and the District of Columbia. 

Nationally representative samples were also drawn for the private school students in grades 4, 8, and 12.

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