NAEP Assessment Sample Design → NAEP 2011 Sample Design → Sample Design for the 2011 National Assessment → 2011 Fourth- and Eighth-Grade Private School National Assessment → Sampling Frame for the 2011 Private School National Assessment → Fourth-and Eighth-Grade Schools and Enrollment in the 2011 Private School Sampling Frame

NAEP Technical DocumentationFourth- and Eighth-Grade Schools and Enrollment in the 2011 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. Enrollment was estimated for each school as the Private School Universe Survey (PSS)--reported enrollment averaged across grades 1 through 8.

The counts presented below are of schools with known affiliation. Schools with unknown affiliation 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 with unknown affiliation was selected for each of the targeted grades to improve NAEP coverage. 

Number of schools and enrollment in private school sampling frame, national assessment, by affiliation and grade: 2011

Grade	Affiliation	Number of schools	Estimated enrollment
4	Total	20,110	383,849
	Catholic	5,974	171,054
	Non-Catholic private	14,136	212,795
	Lutheran	1,374	18,086
	Conservative Christian	4,080	61,504
	Other private	8,682	133,205
8	Total	17,968	369,381
	Catholic	5,465	170,509
	Non-Catholic private	12,503	198,872
	Lutheran	1,166	16,579
	Conservative Christian	3,636	57,363
	Other private	7,701	124,930
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2011 National Assessment.

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