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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 | 17 | 16 | 14 | 17 | 25 |
Multiple choice | 12 | 11 | 11 | 12 | 10 | 12 | 15 | |
Dichotomously scored constructed response | 0 | 1 | 2 | 0 | 0 | 2 | 3 | |
Polytomously scored constructed response | 5 | 4 | 4 | 4 | 4 | 3 | 7 | |
Unweighted sample size | 2,300 | 2,300 | 2,300 | 2,300 | 2,300 | 2,300 | 2,400 | |
Weighted average item score | 0.49 | 0.52 | 0.49 | 0.40 | 0.44 | 0.67 | 0.50 | |
Weighted average polyserial | 0.58 | 0.50 | 0.61 | 0.50 | 0.58 | 0.62 | 0.53 | |
Weighted alpha reliability | 0.77 | 0.68 | 0.79 | 0.69 | 0.74 | 0.77 | 0.80 | |
Weighted proportion of students attempting last item1 | 0.98 | 0.97 | 0.97 | 0.91 | 0.73 | 0.94 | 0.99 | |
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), 2001 Geography Assessment. |