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National school and student participation rates in NAEP mathematics at age 9, by type of school: 2008
  School participation  Student participation
  Student-weighted School-weighted Number of schools participating after substitution Student-weighted percent Number of students assessed
Type of school Percent before substitution Percent
Percent before substitution Percent
     Nation 96 97 91 92 430 95 8,600
Public 98 99 98 99 300 95 7,100
Private 72 82 69 76 140 95 1,600
NOTE: Columns of percentages have different denominators. The student-weighted school participation rates are calculated based on the estimated number of students represented by either the initially selected schools that participated in the assessment (before substitution) or the participating schools whether originally selected or selected as a substitute for a school that chose not to participate (after substitution). The school-weighted school participation rates are calculated based on the estimated number of schools either before or after substitution. The numbers of schools are rounded to the nearest ten, and the numbers of students are rounded to the nearest hundred. Detail may not sum to totals because of rounding.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2008 Long-Term Trend Mathematics Assessment.

2008 Long-Term Trend Report Card 2008 Long-Term Trend Report Card