NAEP Assessment Sample Design → NAEP 2009 Sample Design → Sample Design for the 2009 National Assessment → 2009 Private School National Assessment → Sampling Frame for the 2009 Private School National Assessment → Fourth-, Eighth-, and Twelfth-Grade Schools and Enrollment in the 2009 Private School Sampling Frame

NAEP Technical DocumentationFourth-, Eighth-, and Twelfth-Grade Schools and Enrollment in the 2009 Private School Sampling Frame

The following table displays, by grade and affiliation, the number of private schools in the sampling frame and their estimated enrollment. For grades 4 and 8, enrollment was estimated for each school as the Private School Universe Survey (PSS)-reported enrollment averaged across grades 1 through 8. For grade 12, the average was computed over grades 9 through 12.

The counts presented below are of respondents to the PSS. PSS nonrespondents do not appear in the table because their grade span, affiliation, and enrollment were unknown. Although PSS is a school universe survey, participation is voluntary and not all private schools respond. Since the NAEP sample must represent all private schools, not just PSS respondents, a small sample of PSS nonrespondents was selected for each of the three targeted grades to improve NAEP coverage.

Number of schools and enrollment in private school sampling frame, by affiliation and grade: 2009

Grade	Affiliation	Number of schools	Estimated enrollment
4	Total	19,605	375,710
	Catholic	5,917	172,812
	Non-Catholic	13,688	202,898
8	Total	17,308	358,165
	Catholic	5,355	170,618
	Non-Catholic	11,953	187,547
12	Total	8,611	310,293
	Catholic	1,235	149,562
	Non-Catholic	7,376	160,731
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2009 Assessment.

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