Table of Contents | Search Technical Documentation | References
Statistic | Item type | Block S3 | Block S5 | Block S6 | Block S7 | Block S8 | Block S9 | Block S10 | Block S11 | Block S12 | Block S13 | Block S14 | Block S15 | Block S20 | Block S21 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Number of scaled items | Total | 6 | 8 | 6 | 20 | 10 | 13 | 20 | 16 | 16 | 15 | 16 | 15 | 20 | 16 |
Multiple choice | 0 | 0 | 0 | 14 | 5 | 3 | 14 | 8 | 8 | 8 | 7 | 6 | 14 | 7 | |
Dichotomously scored constructed response | 3 | 3 | 4 | 2 | 1 | 4 | 2 | 3 | 3 | 1 | 3 | 2 | 1 | 3 | |
Polytomously scored constructed response | 3 | 5 | 2 | 4 | 4 | 6 | 4 | 5 | 5 | 6 | 6 | 7 | 5 | 6 | |
Unweighted sample size | 2,500 | 2,500 | 2,600 | 3,400 | 3,400 | 3,400 | 2,600 | 2,500 | 2,500 | 2,500 | 3,400 | 2,600 | 2,600 | 2,600 | |
Weighted average item score | 0.48 | 0.39 | 0.29 | 0.44 | 0.57 | 0.51 | 0.49 | 0.45 | 0.34 | 0.40 | 0.46 | 0.36 | 0.43 | 0.43 | |
Weighted average polyserial | 0.74 | 0.76 | 0.75 | 0.50 | 0.69 | 0.58 | 0.54 | 0.55 | 0.55 | 0.52 | 0.56 | 0.56 | 0.49 | 0.53 | |
Weighted alpha reliability | 0.74 | 0.71 | 0.39 | 0.71 | 0.67 | 0.68 | 0.76 | 0.73 | 0.72 | 0.67 | 0.72 | 0.70 | 0.70 | 0.73 | |
Weighted proportion of students attempting last item1 | 0.74 | 0.48 | 0.80 | 0.82 | 0.96 | 0.94 | 0.98 | 0.83 | 0.80 | 0.91 | 0.97 | 0.86 | 0.98 | 0.87 | |
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 Science Assessment. |