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Statistic | Item type | Block C3 | Block C4 | Block C5 | Block C6 | Block C7 | Block C8 | Block C9 | Block C10 |
---|---|---|---|---|---|---|---|---|---|
Number of scaled items | Total | 20 | 19 | 18 | 19 | 19 | 18 | 19 | 19 |
Multiple choice | 15 | 16 | 14 | 15 | 15 | 15 | 16 | 15 | |
Dichotomously scored constructed response | 1 | 0 | 0 | 2 | 0 | 1 | 0 | 0 | |
Polytomously scored constructed response | 4 | 3 | 4 | 2 | 4 | 2 | 3 | 4 | |
Unweighted sample size | † | 2,300 | 2,300 | 2,300 | 2,300 | 2,300 | 2,300 | 2,300 | 2,300 |
Weighted average item score | † | 0.55 | 0.44 | 0.45 | 0.52 | 0.45 | 0.56 | 0.52 | 0.54 |
Weighted average polyserial | † | 0.50 | 0.56 | 0.54 | 0.54 | 0.47 | 0.53 | 0.54 | 0.59 |
Weighted alpha reliability | † | 0.72 | 0.78 | 0.75 | 0.76 | 0.69 | 0.73 | 0.75 | 0.81 |
Weighted proportion of students attempting last item1 | † | 0.96 | 0.96 | 0.93 | 0.96 | 0.90 | 0.95 | 0.98 | 0.94 |
† 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. |