For the mathematics, reading, and science assessments in fourth- and eighth-grade public schools, the national samples were the state assessment samples for each jurisdiction. All states participated in the mathematics, reading, and science assessments. By design, only Bureau of Indian Education (BIE) schools did not participate in the state science assessment, as it lacked the required number of students for the state science assessment. A small portion of students received the science assessment in BIE schools in science to supplement the national science sample.
Additional details of the national science sample are also described as part of the state assessment samples.