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Statistic | Item type | Block G3 | Block G4 | Block G5 | Block G6 | Block G7 | Block G8 | Block G9 |
---|---|---|---|---|---|---|---|---|
Number of scaled items | Total | 17 | 16 | 16 | 16 | 14 | 17 | 25 |
Multiple choice | 12 | 11 | 11 | 12 | 10 | 12 | 15 | |
Dichtomously scored constructed response | 0 | 0 | 1 | 0 | 1 | 1 | 1 | |
Polytomously scored constructed response | 5 | 5 | 4 | 4 | 3 | 4 | 9 | |
Unweighted sample size | † | 2,300 | 2,300 | 2,300 | 2,300 | 2,300 | 2,200 | 2,200 |
Weighted average item score | † | .49 | .51 | .51 | .42 | .56 | .47 | .54 |
Weighted average polyserial | † | .56 | .51 | .51 | .51 | .61 | .48 | .53 |
Weighted alpha reliability | † | .73 | .70 | .71 | .72 | .74 | .68 | .80 |
Weighted proportion of students attempting last item1 | † | .96 | .94 | .90 | .86 | .72 | .90 | .98 |
† Not applicable. 1The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item /100). 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. Item statistics in this table are described on the page Blocks of Items. In 2014, grades 4 and 12 were not assessed. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2014 Geography Assessment. |