NAEP Assessment Sample Design → NAEP 2009 Sample Design → Sample Design for the 2009 National Assessment → 2009 Private School National Assessment

NAEP Technical Documentation2009 Private School National Assessment

			Target Population Sampling Frame Stratification of Schools School Sample Selection Substitute Schools Ineligible Schools Student Sample Selection School and Student Participation

The private school samples were designed to produce nationally representative samples of students enrolled in private schools in the United States. Fourth-, eighth-, and twelfth-grade students were assessed in mathematics, reading, and science.  

The target sample sizes of assessed students for each grade and subject are shown in the table below. Prior to sampling, these target sample sizes were adjusted upward to offset expected rates of school and student attrition due to nonresponse and ineligibility.

Target sample sizes of assessed students, private school national assessment, by subject and grade: 2009

Grade	Total	Mathematics	Reading	Science
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2009 Assessment.
4	9,000	3,000	3,000	3,000
8	9,000	3,000	3,000	3,000
12	5,700	2,200	2,400	1,100

Samples were based on a two-stage design that involved 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.

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