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Statistic | Item type | Block M3 | Block M4 | Block M5 | Block M6 | Block M7 | Block M8 | Block M9 | Block M10 | Block M11 | Block M12 |
---|---|---|---|---|---|---|---|---|---|---|---|
Number of scaled items | Total | 18 | 14 | 15 | 21 | 20 | 19 | 18 | 18 | 18 | 18 |
Multiple choice | 8 | 5 | 7 | 16 | 14 | 13 | 10 | 12 | 15 | 14 | |
Dichotomously scored constructed response | 5 | 5 | 3 | 5 | 2 | 2 | 3 | 3 | 1 | 3 | |
Polytomously scored constructed response | 5 | 4 | 5 | 0 | 4 | 4 | 5 | 3 | 2 | 1 | |
Unweighted sample size | † | 37,700 | 37,500 | 37,500 | 39,000 | 37,800 | 37,600 | 39,400 | 37,700 | 37,700 | 37,700 |
Weighted average item score | † | 0.53 | 0.50 | 0.48 | 0.50 | 0.53 | 0.54 | 0.55 | 0.62 | 0.57 | 0.60 |
Weighted average polyserial | † | 0.61 | 0.65 | 0.57 | 0.54 | 0.57 | 0.53 | 0.62 | 0.57 | 0.59 | 0.57 |
Weighted alpha reliability | † | 0.81 | 0.78 | 0.77 | 0.76 | 0.80 | 0.76 | 0.80 | 0.74 | 0.78 | 0.75 |
Weighted proportion of students attempting last item1 | † | 0.91 | 0.89 | 0.65 | 0.82 | 0.65 | 0.66 | 0.86 | 0.99 | 0.93 | 0.97 |
† Not applicable. 1 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), 2003 Mathematics Assessment. |