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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 | Block M13 | Block M14 | Block M15 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Number of scaled items | Total | 14 | 22 | 8 | 17 | 8 | 21 | 9 | 9 | 14 | 9 | 9 | 10 | 10 |
Multiple choice | 10 | 22 | 1 | 0 | 3 | 17 | 6 | 6 | 11 | 5 | 6 | 4 | 4 | |
Dichotomously scored constructed response | 4 | 0 | 0 | 17 | 0 | 4 | 2 | 0 | 3 | 0 | 0 | 1 | 1 | |
Polytomously scored constructed response | 0 | 0 | 7 | 0 | 5 | 0 | 1 | 3 | 0 | 4 | 3 | 5 | 5 | |
Unweighted sample size | 3,100 | 3,100 | 3,100 | 3,100 | 3,100 | 3,100 | 3,100 | 3,000 | 3,000 | 3,100 | 3,100 | 3,000 | 3,100 | |
Weighted average item score | 0.42 | 0.68 | 0.33 | 0.55 | 0.45 | 0.54 | 0.47 | 0.44 | 0.45 | 0.43 | 0.42 | 0.48 | 0.33 | |
Weighted average polyserial | 0.68 | 0.60 | 0.74 | 0.72 | 0.71 | 0.64 | 0.61 | 0.66 | 0.63 | 0.67 | 0.68 | 0.72 | 0.70 | |
Weighted alpha reliability | 0.73 | 0.79 | 0.73 | 0.84 | 0.70 | 0.81 | 0.58 | 0.70 | 0.72 | 0.73 | 0.70 | 0.76 | 0.69 | |
Weighted proportion of students attempting last item1 | 0.68 | 0.86 | 0.77 | 0.74 | 0.86 | 0.59 | 0.93 | 0.95 | 0.72 | 0.92 | 0.95 | 0.83 | 0.88 | |
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), 2000 Mathematics Assessment. |