Statistic | Type of school1 | Block H3 | Block H4 | Block H5 | Block H6 | Block H7 | Block H8 | Block H9 | Block H10 | Block H11 | Block H12 |
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† Not applicable. 1 Nonpublic school sample includes only private and Catholic schools. 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 | † | 17 | 16 | 17 | 16 | 16 | 17 | 17 | 16 | 16 | 16 |
Unweighted sample size | Public | 2,200 | 2,200 | 2,200 | 2,100 | 2,200 | 2,200 | 2,200 | 2,200 | 2,200 | 2,200 |
Nonpublic | 200 | 200 | 200 | 200 | 200 | 200 | 200 | 200 | 200 | 200 | |
Weighted average item score | Public | .57 | .47 | .45 | .47 | .50 | .49 | .40 | .40 | .38 | .47 |
Nonpublic | .66 | .56 | .52 | .54 | .60 | .59 | .47 | .46 | .45 | .56 | |
Weighted average polyserial | Public | .57 | .53 | .57 | .53 | .55 | .53 | .51 | .49 | .50 | .57 |
Nonpublic | .56 | .50 | .55 | .48 | .53 | .47 | .46 | .51 | .47 | .50 | |
Weighted alpha reliability | Public | .74 | .75 | .74 | .73 | .75 | .75 | .71 | .61 | .67 | .77 |
Nonpublic | .69 | .69 | .73 | .64 | .69 | .67 | .64 | .64 | .64 | .68 | |
Weighted proportion of students attempting last item | Public | .96 | .95 | .90 | .95 | .97 | .90 | .94 | .91 | .95 | .94 |
Nonpublic | .99 | .99 | .96 | .98 | .99 | .94 | .96 | .95 | .98 | .98 |