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Statistic | Item type | Block G3 | Block G4 | Block G5 | Block G6 | Block G7 | Block G8 |
---|---|---|---|---|---|---|---|
Number of scaled items | Total | 15 | 15 | 14 | 15 | 14 | 17 |
Multiple choice | 10 | 10 | 10 | 10 | 10 | 12 | |
Dichotomously scored constructed response | 1 | 3 | 2 | 0 | 2 | 3 | |
Polytomously scored constructed response | 4 | 2 | 2 | 5 | 2 | 2 | |
Unweighted sample size | 2,300 | 2,300 | 2,300 | 2,300 | 2,300 | 2,300 | |
Weighted average item score | 0.55 | 0.58 | 0.57 | 0.48 | 0.49 | 0.44 | |
Weighted average polyserial | 0.57 | 0.58 | 0.60 | 0.53 | 0.63 | 0.51 | |
Weighted alpha reliability | 0.76 | 0.76 | 0.74 | 0.72 | 0.79 | 0.69 | |
Weighted proportion of students attempting last item1 | 0.87 | 0.94 | 0.92 | 0.87 | 0.62 | 0.79 | |
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. |