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Statistic | Type of school1 | Block R3 | Block R4 | Block R5 | Block R6 | Block R7 | Block R8 | Block R9 | Block R10 | Block R11 | Block R12 | Block R13 | Block R14 | Block R15 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Number of scaled items | † | 10 | 9 | 11 | 12 | 13 | 11 | 9 | 12 | 12 | 10 | 13 | 10 | 10 |
Unweighted sample size | Public | 22,400 | 22,700 | 22,400 | 22,400 | 22,600 | 22,600 | 22,500 | 22,700 | 22,500 | 22,500 | 15,000 | 22,500 | 22,500 |
Nonpublic | 1,000 | 1,000 | 1,000 | 1,000 | 1,000 | 1,000 | 1,000 | 1,000 | 1,000 | 1,000 | 700 | 1,000 | 1,000 | |
Weighted average item score | Public | 0.41 | 0.55 | 0.68 | 0.56 | 0.69 | 0.71 | 0.65 | 0.56 | 0.67 | 0.66 | 0.64 | 0.72 | 0.78 |
Nonpublic | 0.51 | 0.63 | 0.79 | 0.65 | 0.78 | 0.80 | 0.74 | 0.69 | 0.78 | 0.77 | 0.71 | 0.82 | 0.86 | |
Weighted average polyserial | Public | 0.69 | 0.62 | 0.71 | 0.63 | 0.71 | 0.66 | 0.74 | 0.62 | 0.68 | 0.72 | 0.59 | 0.71 | 0.69 |
Nonpublic | 0.66 | 0.59 | 0.71 | 0.60 | 0.68 | 0.59 | 0.72 | 0.56 | 0.62 | 0.70 | 0.55 | 0.71 | 0.62 | |
Weighted alpha reliability | Public | 0.76 | 0.69 | 0.77 | 0.71 | 0.79 | 0.69 | 0.71 | 0.73 | 0.77 | 0.78 | 0.73 | 0.70 | 0.67 |
Nonpublic | 0.74 | 0.62 | 0.67 | 0.61 | 0.68 | 0.49 | 0.65 | 0.64 | 0.67 | 0.71 | 0.65 | 0.58 | 0.47 | |
Weighted proportion of students attempting last item2 | Public | 0.82 | 0.85 | 0.94 | 0.87 | 0.85 | 0.95 | 0.92 | 0.78 | 0.88 | 0.96 | 0.94 | 0.87 | 0.96 |
Nonpublic | 0.87 | 0.89 | 0.98 | 0.92 | 0.89 | 0.97 | 0.95 | 0.82 | 0.91 | 0.98 | 0.96 | 0.93 | 0.97 | |
† 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), 2005 Reading Assessment. |