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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Assembly Units as Defined After Scaling, Grade 8 Technology and Engineering Literacy (TEL) National Assessment, by Assembly Unit and Item Type: 2018
NAEP Technical DocumentationOverall Descriptive Statistics for Assembly Units as Defined After Scaling, Grade 8 Technology and Engineering Literacy (TEL) National Assessment, by Assembly Unit and Item Type: 2018
| Statistic | Item type | Assembly unit T1 | Assembly unit T3 | Assembly unit T5 | Assembly unit T6 | Assembly unit T7 | Assembly unit T8 | Assembly unit T9 | Assembly unit T10 | Assembly unit T12 | Assembly unit T13 | Assembly unit T14 | Assembly unit T15 | Assembly unit T16 | Assembly unit T17 | Assembly unit T20 | Assembly unit T21 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of scaled items | Total | 12 | 11 | 11 | 9 | 8 | 9 | 12 | 12 | 9 | 11 | 12 | 10 | 10 | 14 | 16 | 11 |
| Multiple choice | 2 | 3 | 0 | 1 | 1 | 2 | 4 | 4 | 2 | 1 | 3 | 4 | 0 | 3 | 7 | 2 | |
| Dichotomously scored constructed-response | 6 | 5 | 9 | 4 | 4 | 4 | 3 | 3 | 3 | 6 | 1 | 2 | 5 | 7 | 7 | 6 | |
| Polytomously scored constructed-response | 4 | 3 | 2 | 4 | 3 | 3 | 5 | 5 | 4 | 4 | 8 | 4 | 5 | 4 | 2 | 3 | |
| Unweighted sample size | † | 1,900 | 1,900 | 2,000 | 1,900 | 1,900 | 1,900 | 2,000 | 1,900 | 1,900 | 1,900 | 1,900 | 1,900 | 1,900 | 1,900 | 1,900 | 1,900 |
| Weighted average item score1 | † | .59 | .61 | .63 | .59 | .53 | .62 | .61 | .58 | .57 | .53 | .63 | .60 | .59 | .64 | .61 | .54 |
| Weighted average polyserial | † | .67 | .72 | .68 | .68 | .73 | .72 | .62 | .61 | .67 | .58 | .66 | .63 | .68 | .59 | .68 | .58 |
| Weighted alpha reliability | † | .78 | .79 | .72 | .71 | .71 | .73 | .73 | .67 | .70 | .63 | .78 | .67 | .74 | .72 | .83 | .63 |
| Weighted proportion of students attempting last item2 | † | .93 | .90 | .97 | .88 | .80 | .96 | .94 | .97 | .95 | .95 | .94 | .86 | .93 | .94 | .92 | .92 |
| † Not applicable. 1 The "Weighted average item score" of polytomous items is standardized to have a scale of 0 to 1 so they are comparable to dichotomously scored items. 2 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), 2018 Technology and Engineering Literacy (TEL) Assessment. | |||||||||||||||||
Last updated 09 January 2023 (PG)