The NAEP 2008 arts sample design yielded a nationally representative sample of grade 8 private school students through a three-stage approach: selection of primary sampling units (PSUs), selection of schools within strata, and selection of students within schools. The sample of schools was selected with probability proportional to a measure of size based on the estimated eighth-grade enrollment in the schools.
The general arts sampling plan was designed to assess 600 eighth-graders within the NAEP private school sample.
These students were allocated among two tests. The operational tests were in music and visual arts.
As in the past assessments, Black and Hispanic students were oversampled at a moderate rate. Schools in high Black/Hispanic stratum (i.e., schools with 15 percent or more Black and Hispanic students and at least 10 Black or Hispanic students in the eighth grade) were sampled at twice the rate as schools in low Black/Hispanic stratum to implement oversampling of Black and Hispanic students.
From the stratified frame of private schools, a systematic random sample of eighth-grade schools was drawn with probability proportional to a measure of size based on the estimated eighth-grade enrollment of the school.
Each selected school in the private school sample provided a list of eligible enrolled students from which a systematic, equal probability sample of students was drawn.