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Statistic | Type of school1 | All items2 |
---|---|---|
Number of scaled items | † | 20 |
Unweighted sample size | Public | 112,500 |
Nonpublic | 5,500 | |
Weighted average item score | Public | 0.53 |
Nonpublic | 0.61 | |
Weighted average polyserial | Public | 0.92 |
Nonpublic | 0.90 | |
† Not applicable. 1 Nonpublic-school sample includes only Catholic and private schools. 2 In NAEP writing assessments, each block contains only one item—a writing prompt to which students respond with a polytomously scored constructed response; therefore, the weighted alpha reliability estimate is not meaningful and does not appear in this table. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2002 Writing Assessment. |