Statistic | Item type | Block G3 | Block G4 | Block G5 | Block G6 | Block G7 | Block G8 | Block G9 |
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† Not applicable. NOTE: The "weighted average item score" of polytomous items are standardized to have a scale of 0 to 1 so they are comparable to dichotomously scored items. The "weighted proportion of students attempting last item" is equal to 1 - (Percent not responding to last item /100). 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), 2010 Geography Assessment. |
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Number of scaled items | Total | 16 | 17 | 17 | 16 | 16 | 16 | 21 |
Multiple choice | 11 | 12 | 13 | 12 | 11 | 10 | 13 | |
Dichtomously scored constructed response | 0 | 1 | 0 | 0 | 0 | 1 | 3 | |
Polytomously scored constructed response | 5 | 4 | 4 | 4 | 5 | 5 | 5 | |
Unweighted sample size | † | 2,500 | 2,500 | 2,500 | 2,500 | 2,500 | 2,500 | 2,400 |
Weighted average item score | † | .55 | .51 | .46 | .56 | .48 | .37 | .50 |
Weighted average polyserial | † | .57 | .52 | .53 | .54 | .55 | .57 | .58 |
Weighted alpha reliability | † | .72 | .73 | .74 | .74 | .73 | .72 | .79 |
Weighted proportion of students attempting last item | † | .95 | .89 | .93 | .95 | .65 | .76 | 1.00 |