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Statistic | Item type | Block C3 | Block C4 | Block C5 | Block C6 | Block C7 | Block C8 |
---|---|---|---|---|---|---|---|
Number of scaled items | Total | 15 | 15 | 15 | 14 | 15 | 14 |
Multiple choice | 11 | 11 | 12 | 10 | 11 | 11 | |
Dichotomously scored constructed response | 0 | 1 | 0 | 1 | 0 | 0 | |
Polytomously scored constructed response | 4 | 3 | 3 | 3 | 4 | 3 | |
Unweighted sample size | † | 2,300 | 2,400 | 2,300 | 2,300 | 2,300 | 2,300 |
Weighted average item score | † | 0.52 | 0.47 | 0.49 | 0.57 | 0.53 | 0.53 |
Weighted average polyserial | † | 0.52 | 0.53 | 0.55 | 0.53 | 0.56 | 0.49 |
Weighted alpha reliability | † | 0.69 | 0.69 | 0.72 | 0.68 | 0.75 | 0.65 |
Weighted proportion of students attempting last item1 | † | 0.88 | 0.90 | 0.88 | 0.87 | 0.81 | 0.91 |
† 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), 2006 Civics Assessment. |