| Percentile, and achievement level |
Grade 4 | Grade 8 | Grade 12 | |||
|---|---|---|---|---|---|---|
| Average scale score | 150 | 150 | 150 | |||
| Percentile | ||||||
| 10th | 104 | 103 | 104 | |||
| 25th | 128 | 128 | 126 | |||
| 50th | 153 | 153 | 151 | |||
| 75th | 175 | 175 | 174 | |||
| 90th | 192 | 192 | 194 | |||
| Percent at each achievement level | ||||||
| Below Basic | 28 | 37 | 40 | |||
| At or above Basic | 72 | 63 | 60 | |||
| At or above Proficient | 34 | 30 | 21 | |||
| At Advanced | 1 | 2 | 1 | |||
| NOTE: The National Assessment of Educational Progress (NAEP) science scale ranges from 0 to 300. Achievement levels define what students should know and be able to do: Basic indicates partial mastery of fundamental skills, Proficient indicates demonstrated competency over challenging subject matter, and Advanced indicates superior performance. The percentage of students at or above Proficient includes students at the Proficient and the Advanced achievement levels. Similarly, the percentage of students at or above Basic includes students at the Basic, Proficient, and Advanced achievement levels. Detail may not sum to totals because of rounding. For more information on NAEP, see supplemental note 4. | ||||||
| SOURCE: U.S. Department of Education, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2009 Science Assessment, NAEP Data Explorer. | ||||||
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