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NAEP Technical DocumentationSchool Response Rates for the 2009 Twelfth-Grade Public School National Assessment

The following table presents unweighted counts of eligible sampled schools and participating schools, as well as weighted school response rates, for the twelfth-grade public school samples in which the mathematics, reading, and science operational assessments were conducted. The weighted school response rates estimate the proportion of the student population that is represented by the participating school sample prior to substitution.

School response counts and rates before substitution, grade 12 public schools, by region: 2009

Region	Number of sample eligible schools	Number of participating schools	Weighted school response rate prior to substitution (percent)
NOTE: School counts of schools are rounded to nearest ten. Detail may not sum to totals due to rounding. Percentages are based on unrounded counts. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2009 Assessment.
National	1,570	1,480	86.39
Northeast	410	400	92.85
Midwest	450	430	91.22
South	460	450	91.94
West	250	210	68.99

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