Table of Contents | Search Technical Documentation | References
Statistic | Type of school1 | Block M3 | Block M4 | Block M5 | Block M6 | Block M7 | Block M8 | Block M9 | Block M10 | Block M11 | Block M12 |
---|---|---|---|---|---|---|---|---|---|---|---|
† 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), 2011 Mathematics Assessment. | |||||||||||
Number of scaled items | † | 15 | 15 | 15 | 16 | 15 | 19 | 16 | 15 | 16 | 16 |
Unweighted sample size | Public | 39,600 | 39,600 | 39,500 | 40,400 | 39,300 | 39,800 | 39,500 | 39,500 | 40,300 | 40,100 |
Nonpublic | 1,200 | 1,200 | 1,200 | 1,200 | 1,200 | 1,200 | 1,200 | 1,200 | 1,200 | 1,200 | |
Weighted average item score | Public | .51 | .53 | .62 | .59 | .51 | .56 | .55 | .56 | .56 | .53 |
Nonpublic | .54 | .57 | .65 | .64 | .55 | .60 | .57 | .59 | .59 | .58 | |
Weighted average polyserial | Public | .62 | .60 | .62 | .60 | .59 | .53 | .64 | .59 | .55 | .57 |
Nonpublic | .62 | .61 | .64 | .60 | .57 | .52 | .62 | .57 | .52 | .55 | |
Weighted alpha reliability | Public | .76 | .74 | .77 | .77 | .76 | .77 | .78 | .70 | .71 | .73 |
Nonpublic | .77 | .74 | .74 | .75 | .74 | .73 | .75 | .67 | .65 | .69 | |
Weighted proportion of students attempting last item | Public | .95 | .90 | .90 | .93 | .88 | .67 | .96 | .96 | .93 | .89 |
Nonpublic | .99 | .94 | .96 | .98 | .93 | .81 | .99 | .97 | .98 | .97 |