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Statistic | Type of school1 | Block M3 | Block M4 | Block M5 | Block M6 | Block M7 | Block M8 | Block M9 | Block M10 | Block M11 | Block M12 |
---|---|---|---|---|---|---|---|---|---|---|---|
Number of scaled items | † | 18 | 20 | 18 | 16 | 16 | 18 | 18 | 16 | 19 | 18 |
Unweighted sample size | Public | 30,500 | 30,400 | 30,500 | 30,600 | 30,800 | 30,600 | 30,300 | 30,500 | 30,300 | 30,500 |
Nonpublic | 1,400 | 1,300 | 1,300 | 1,300 | 1,400 | 1,400 | 1,400 | 1,300 | 1,400 | 1,400 | |
Weighted average item score | Public | 0.53 | 0.60 | 0.58 | 0.48 | 0.49 | 0.52 | 0.48 | 0.50 | 0.54 | 0.55 |
Nonpublic | 0.61 | 0.67 | 0.65 | 0.55 | 0.56 | 0.60 | 0.56 | 0.58 | 0.60 | 0.62 | |
Weighted average polyserial | Public | 0.60 | 0.62 | 0.61 | 0.63 | 0.58 | 0.60 | 0.59 | 0.61 | 0.57 | 0.55 |
Nonpublic | 0.56 | 0.55 | 0.60 | 0.59 | 0.57 | 0.58 | 0.58 | 0.59 | 0.56 | 0.52 | |
Weighted alpha reliability | Public | 0.76 | 0.78 | 0.80 | 0.79 | 0.76 | 0.78 | 0.79 | 0.77 | 0.76 | 0.75 |
Nonpublic | 0.71 | 0.72 | 0.77 | 0.74 | 0.74 | 0.77 | 0.78 | 0.74 | 0.73 | 0.70 | |
Weighted proportion of students attempting last item2 | Public | 0.93 | 0.70 | 0.89 | 0.93 | 0.75 | 0.86 | 0.78 | 0.98 | 0.94 | 0.91 |
Nonpublic | 0.96 | 0.71 | 0.95 | 0.97 | 0.78 | 0.89 | 0.83 | 0.99 | 0.97 | 0.95 | |
† 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 Mathematics Assessment. |