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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 | 18 | 8 | 7 | 17 | 9 | 13 | 19 | 15 | 14 | 15 | 15 | 17 | 14 | 18 | 18 |
Multiple choice | 0 | 12 | 0 | 0 | 12 | 5 | 6 | 14 | 10 | 8 | 7 | 7 | 11 | 10 | 12 | 12 | |
Dichotomously scored constructed response | 3 | 1 | 4 | 4 | 2 | 1 | 3 | 2 | 2 | 1 | 3 | 2 | 0 | 1 | 1 | 0 | |
Polytomously scored constructed response | 3 | 5 | 4 | 3 | 3 | 3 | 4 | 3 | 3 | 5 | 5 | 6 | 6 | 3 | 5 | 6 | |
Unweighted sample size | † | 21,200 | 19,600 | 21,000 | 21,600 | 29,400 | 29,700 | 29,600 | 20,100 | 20,300 | 19,800 | 19,700 | 19,700 | 19,500 | 19,600 | 19,600 | 19,600 |
Weighted average item score | † | 0.49 | 0.42 | 0.47 | 0.38 | 0.47 | 0.58 | 0.55 | 0.50 | 0.37 | 0.41 | 0.48 | 0.39 | 0.51 | 0.47 | 0.54 | 0.48 |
Weighted average polyserial | † | 0.74 | 0.50 | 0.79 | 0.81 | 0.52 | 0.72 | 0.62 | 0.53 | 0.55 | 0.50 | 0.56 | 0.55 | 0.53 | 0.55 | 0.53 | 0.52 |
Weighted alpha reliability | † | 0.70 | 0.66 | 0.73 | 0.50 | 0.67 | 0.65 | 0.72 | 0.74 | 0.70 | 0.63 | 0.72 | 0.70 | 0.72 | 0.69 | 0.75 | 0.75 |
Weighted proportion of students attempting last item1 | † | 0.77 | 0.93 | 0.55 | 0.85 | 0.85 | 0.95 | 0.96 | 0.98 | 0.98 | 0.91 | 0.95 | 0.83 | 0.96 | 0.99 | 0.99 | 0.92 |
† 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. |