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Statistic | Item type | Block S3 | Block S4 | Block S5 | Block S6 | Block S7 | Block S8 | Block S9 | Block S10 | Block S11 | Block S12 | Block S13 | Block S14 | Block S15 | Block S16 | Block S17 | Block S18 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Number of scaled items | Total | 6 | 16 | 8 | 8 | 16 | 11 | 17 | 16 | 15 | 13 | 13 | 13 | 9 | 16 | 15 | 13 |
Multiple choice | 0 | 12 | 0 | 0 | 10 | 6 | 12 | 13 | 10 | 7 | 7 | 8 | 3 | 11 | 10 | 7 | |
Dichotomously scored constructed response | 3 | 1 | 5 | 4 | 1 | 3 | 3 | 0 | 2 | 1 | 4 | 0 | 1 | 1 | 0 | 0 | |
Polytomously scored constructed response | 3 | 3 | 3 | 4 | 5 | 2 | 2 | 3 | 3 | 5 | 2 | 5 | 5 | 4 | 5 | 6 | |
Unweighted sample size | † | 2,000 | 1,800 | 2,000 | 2,000 | 2,800 | 2,900 | 2,700 | 1,900 | 1,900 | 1,900 | 1,900 | 1,900 | 1,900 | 1,900 | 1,900 | 1,900 |
Weighted average item score | † | 0.50 | 0.42 | 0.63 | 0.50 | 0.38 | 0.64 | 0.55 | 0.43 | 0.49 | 0.54 | 0.48 | 0.43 | 0.34 | 0.45 | 0.43 | 0.41 |
Weighted average polyserial | † | 0.82 | 0.57 | 0.84 | 0.79 | 0.56 | 0.69 | 0.55 | 0.47 | 0.59 | 0.61 | 0.61 | 0.59 | 0.68 | 0.53 | 0.55 | 0.56 |
Weighted alpha reliability | † | 0.60 | 0.70 | 0.76 | 0.79 | 0.69 | 0.64 | 0.72 | 0.54 | 0.75 | 0.71 | 0.69 | 0.69 | 0.67 | 0.71 | 0.70 | 0.72 |
Weighted proportion of students attempting last item1 | † | 0.90 | 0.99 | 0.77 | 0.84 | 0.88 | 0.88 | 0.86 | 0.97 | 0.98 | 0.90 | 0.90 | 0.85 | 0.76 | 0.98 | 0.98 | 0.98 |
† 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), 2005 Science Assessment. |