Table of Contents | Search Technical Documentation | References
Statistic | Item type | Block M21 | Block M22 | Block M23 | Block M24 | Block MX51 | Block MX52 |
---|---|---|---|---|---|---|---|
Number of scaled items | Total | 23 | 22 | 37 | 36 | 23 | 22 |
Multiple choice | 18 | 17 | 28 | 28 | 18 | 17 | |
Dichotomously scored constructed response | 5 | 5 | 9 | 8 | 5 | 5 | |
Polytomously scored constructed response | 0 | 0 | 0 | 0 | 0 | 0 | |
Unweighted sample size | † | 3,800 | 3,700 | 3,800 | 3,700 | 3,700 | 3,700 |
Weighted average item score | † | 0.69 | 0.72 | 0.69 | 0.68 | 0.60 | 0.66 |
Weighted average polyserial | † | 0.61 | 0.62 | 0.58 | 0.58 | 0.59 | 0.63 |
Weighted alpha reliability | † | 0.83 | 0.82 | 0.88 | 0.87 | 0.81 | 0.83 |
Weighted proportion of students attempting last item1 | † | 0.97 | 0.95 | 0.87 | 0.79 | 0.96 | 0.97 |
† Not applicable. 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), 2004 Mathematics Long-Term Trend Assessment. |