The target population for the 2003 national main assessment included all students in public or private schools who were enrolled in the fourth or eighth grades in the 50 states and the District of Columbia. Counts of fourth- and eighth-grade public schools and the corresponding estimated number of students are found on the page Distribution of Fourth- and Eighth-Grade Schools and Enrollment in Public School Sampling Frame. Counts of twelfth-grade public schools and the corresponding estimated number of students are found on the page Sampling Frame for the 2003 National Main Assessment. Counts of fourth-, eighth-, and twelfth-grade private schools and the corresponding estimated number of students are provided in the table below.
|Grade||Private school stratum||Number of schools||Enrollment|
|Other private and unknown affiliation||7,536||110,834|
|Other private and unknown affiliation||6,482||103,251|
|Other private and unknown affiliation||4,061||91,372|
|SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, Private School Universe Survey (PSS), 1999-2000.|