NAEP Assessment Sample Design → NAEP 2011 Sample Design → Sample Design for the 2011 National Assessment → 2011 Writing Computer-Based Assessment (WCBA) → Selection of Primary Sampling Units for the 2011 WCBA and MCBS Assessments → Final Primary Sampling Unit (PSU) Sample for the 2011 Assessments

NAEP Technical DocumentationFinal Primary Sampling Unit (PSU) Sample for the 2011 Assessments

For the writing computer-based assessment (WCBA) and mathematics computer-based study (MCBS), a primary sampling unit (PSU) sample was drawn independently from each of the 76 noncertainty strata defined in Final Primary Sampling Unit Strata. One PSU was selected with probability proportionate to size (with size equal to estimated number of youths) within each stratum. The selection of the noncertainty PSUs was designed to minimize the overlap with the 2008 LTT sample, the 2009 science sample, and the 2010 sample.

Also, 29 PSUs were included in the sample of PSUs with certainty.

Distribution of sampled PSUs, computer-based writing and mathematics assessments, by PSU type: 2011

PSU type	Number of sampled PSUs
	SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2011 National Assessment.
Total	105
Census region
Northeast	15
Midwest	23
South	42
West	25
Certainty/metropolitan status
Certainty metropolitan	29
Noncertainty metropolitan	54
Noncertainty non-metropolitan	22

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