Statistic | Item type | Block H3 | Block H4 | Block H5 | Block H6 | Block H7 | Block H8 | Block H9 | Block H10 | Block H11 |
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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 U.S. History Assessment. |
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Number of scaled items | Total | 18 | 18 | 18 | 17 | 18 | 18 | 18 | 16 | 16 |
Multiple choice | 13 | 13 | 13 | 12 | 13 | 13 | 13 | 11 | 6 | |
Dichtomously scored constructed response | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | |
Polytomously scored constructed response | 5 | 2 | 5 | 5 | 5 | 5 | 5 | 4 | 10 | |
Unweighted sample size | † | 2,500 | 2,500 | 2,500 | 2,500 | 2,500 | 2,500 | 2,400 | 2,500 | 2,500 |
Weighted average item score | † | .46 | .42 | .48 | .43 | .45 | .53 | .48 | .48 | .57 |
Weighted average polyserial | † | .53 | .58 | .53 | .57 | .50 | .54 | .55 | .58 | .66 |
Weighted alpha reliability | † | .75 | .79 | .76 | .74 | .73 | .76 | .78 | .74 | .83 |
Weighted proportion of students attempting last item | † | .93 | .92 | .97 | .98 | .94 | .94 | .95 | .93 | .92 |