NAEP Assessment Sample Design → NAEP 2009 Sample Design → Sample Design for the 2009 National Assessment → Hands-On Tasks (HOT) and Interactive Computer Tests (ICT) for the 2009 Science Assessment → Public School 2009 Science HOT and ICT Assessments → Sampling Frame for the Public School 2009 Science HOT and ICT Assessments

NAEP Technical DocumentationSampling Frame for the  Public School 2009Science HOT and ICT Assessments

The sampling frame for public schools was derived from the Common Core of Data (CCD) file corresponding to the 2005-2006 school year. The CCD files provided the frame for all regular public, state-operated public, Bureau of Indian Education (BIE), and Department of Defense Domestic Dependent Elementary and Secondary Schools (DDESS) open during the 2005-2006 school year. 

The sampling frame was restricted to schools located in the primary sampling units (PSUs) selected for the NAEP 2009 science hands-on tasks (HOT) and interactive computer tests (ICT) assessments. The sampling frame also excluded ungraded schools, vocational schools with no enrollment, special-education-only schools, homeschool entities, prison or hospital schools, and juvenile correctional institutions.

The following table presents the number of schools and estimated enrollment for the public school frame for grades 4, 8, and 12. The unweighted estimated enrollment is restricted to the selected PSUs. The weighted estimated enrollment incorporates the PSU weight (inverse of the probability of selecting the PSU), and thus is a national estimate of the number of public school students in each grade.

Number of schools and enrollment in public school sampling frame, science hands-on tasks (HOT) and interactive computer tests (ICT), by grade: 2009

Grade	School count in sampled PSUs	Estimated enrollment (unweighted)	Estimated enrollment (weighted)
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2009 Science Assessment.
4	20,739	1,745,648	3,664,883
8	9,423	1,753,724	3,712,952
12	7,327	1,528,658	3,223,515

For quality control purposes, school and student counts from the sampling frame were compared to school and student counts from previous public school frames by grade. No major discrepancies were found.

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