National Assessment of Educational Progress, 2008 Long-Term Trend Study
The National Assessment of Educational Progress, 2008 Long-Term Trend Study (NAEP 2008 LTT), is a study that is part of the National Assessment of Educational Progress (NAEP) program; program data available since 1971 at <https://nces.ed.gov/nationsreportcard/naepdata/>. NAEP 2008 LTT …