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Statistic | Type of school1 | Block H3 | Block H4 | Block H5 | Block H6 | Block H7 | Block H8 | Block H9 | Block H10 | Block H11 |
---|---|---|---|---|---|---|---|---|---|---|
Number of scaled items | † | 17 | 16 | 17 | 17 | 16 | 17 | 16 | 16 | 13 |
Unweighted sample size | Public | 1,900 | 1,900 | 1,900 | 2,000 | 1,900 | 1,900 | 1,900 | 2,000 | 1,900 |
Nonpublic | 300 | 300 | 300 | 300 | 300 | 300 | 300 | 300 | 300 | |
Weighted average item score | Public | 0.57 | 0.45 | 0.44 | 0.46 | 0.66 | 0.64 | 0.42 | 0.39 | 0.43 |
Nonpublic | 0.66 | 0.55 | 0.53 | 0.59 | 0.75 | 0.69 | 0.50 | 0.45 | 0.56 | |
Weighted average polyserial | Public | 0.58 | 0.54 | 0.58 | 0.52 | 0.56 | 0.60 | 0.52 | 0.50 | 0.62 |
Nonpublic | 0.52 | 0.55 | 0.54 | 0.51 | 0.56 | 0.64 | 0.49 | 0.54 | 0.56 | |
Weighted alpha reliability | Public | 0.75 | 0.76 | 0.76 | 0.72 | 0.73 | 0.76 | 0.68 | 0.62 | 0.76 |
Nonpublic | 0.65 | 0.74 | 0.74 | 0.68 | 0.66 | 0.78 | 0.65 | 0.68 | 0.64 | |
Weighted proportion of students attempting last item2 | Public | 0.97 | 0.98 | 0.91 | 0.97 | 0.93 | 0.98 | 0.98 | 0.89 | 1.00 |
Nonpublic | 0.98 | 0.96 | 0.93 | 0.99 | 0.99 | 0.99 | 0.99 | 0.92 | 1.00 | |
† Not applicable. 1 Nonpublic-school sample includes only Catholic and private schools. 2 The "Weighted proportion of students attempting last item" is equal to 1 - (Percent not responding to last item /100). NOTE: Item statistics in this table are described on the page Blocks of Items. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2001 U.S. History Assessment. |