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Statistic | Item type | Block R3 | Block R4 | Block R5 | Block R6 | Block R7 | Block R8 | Block R9 | Block R10 |
---|---|---|---|---|---|---|---|---|---|
Number of scaled items | Total | 9 | 12 | 11 | 9 | 10 | 9 | 9 | 12 |
Multiple choice | 3 | 5 | 7 | 4 | 4 | 3 | 3 | 6 | |
Dichotomously scored constructed response | 3 | 6 | 3 | 2 | 5 | 1 | 1 | 5 | |
Polytomously scored constructed response | 3 | 1 | 1 | 3 | 1 | 5 | 5 | 1 | |
Unweighted sample size | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | |
Weighted average item score | 0.49 | 0.63 | 0.45 | 0.61 | 0.43 | 0.53 | 0.61 | 0.65 | |
Weighted average polyserial | 0.65 | 0.69 | 0.63 | 0.73 | 0.69 | 0.64 | 0.64 | 0.66 | |
Weighted alpha reliability | 0.70 | 0.80 | 0.75 | 0.78 | 0.73 | 0.73 | 0.77 | 0.77 | |
Weighted proportion of students attempting last item1 | 75.65 | 67.47 | 76.11 | 70.49 | 65.28 | 74.58 | 72.04 | 85.28 | |
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. |