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Number of public high school-level teachers who reported a specific main assignment and the percentage with a major and certification in that main assignment, by subject of main assignment: 2007–08

Selected main assignment Number of teachers Major in main assignment No major in main assignment
  Total   Certified   Not certified     Total   Certified   Not certified     Total certified  
Mathematics  143,600   72.5   63.1   9.4     27.5   16.4   11.1     79.5  
Science  119,800   84.0   73.6   10.4     16.0   12.0   4.0     85.6  
Biology/life sciences  53,800   76.1   60.2   16.0     23.9   17.2   6.7     77.4  
Physical science  58,100   48.5   39.5   9.0     51.5   29.9   21.6     69.4  
Chemistry  24,500   48.2   36.8   11.4     51.8   34.6   17.3     71.4  
Earth sciences  8,500   33.2   27.2   6.0 !   66.8   23.3   43.5     50.4  
Physics  8,800   57.7   42.7   15.0 !   42.3   28.1   14.1     70.8  
NOTE: Teachers include traditional public and public charter teachers who taught departmentalized classes to students in any of grades 10–12, or grade 9 and no grade lower. Each main assignment includes several subfields. Under science, several subfields are examined in detail. These subfields are not inclusive of all subfields in the subject and, therefore, do not add to the broad field total. "Major in main assignment" include all teachers, regardless of whether the major was held within or outside the school/college of education. Majors in main assignment are credited if they were held at the bachelor's degree level or higher. "Certified" columns contain teachers with a regular/probationary certification in-subject and at the secondary level. Detail may not sum to totals because of rounding and because some data are not shown.
SOURCE: U.S. Department of Education, National Center for Education Statistics, Schools and Staffing Survey (SASS), "Public School Teacher Data File," 2007–08.

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