Table of Contents | Search Technical Documentation | References

NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Assembly Unit-level Descriptive Statistics as Defined After Scaling, Grade 8 Technology and Engineering Literacy (TEL) National Assessment, by Public and Nonpublic School Sessions: 2014

NAEP Technical DocumentationAssembly Unit-level Descriptive Statistics as Defined After Scaling, Grade 8 Technology and Engineering Literacy (TEL) National Assessment, by Public and Nonpublic School Sessions: 2014

Assembly unit-level descriptive statistics as defined after scaling, grade 8 technology and engineering literacy (TEL) national assessment, by public and nonpublic school sessions: 2014
Statistic	Type of school¹	Assembly unit T1	Assembly unit T2	Assembly unit T3	Assembly unit T4	Assembly unit T5	Assembly unit T6	Assembly unit T7	Assembly unit T8	Assembly unit T9	Assembly unit T10	Assembly unit T11	Assembly unit T12	Assembly unit T13	Assembly unit T14	Assembly unit T15	Assembly unit T16	Assembly unit T17	Assembly unit T18	Assembly unit T19	Assembly unit T20	Assembly unit T21
Number of scaled items	†	12	6	11	10	11	9	8	9	12	13	11	9	11	12	11	10	14	12	13	16	11
Unweighted sample size	Public	1,800	1,800	1,800	1,800	1,800	1,800	1,800	1,800	1,800	1,800	1,800	1,800	1,800	1,800	1,800	1,800	1,800	1,800	1,800	1,800	1,800
Unweighted sample size	Nonpublic	200	200	200	200	200	200	200	200	200	200	200	200	200	200	200	200	200	200	200	200	200
Weighted average item score²	Public	.59	.57	.60	.59	.62	.57	.49	.61	.58	.59	.63	.54	.53	.59	.57	.57	.62	.59	.62	.60	.52
Weighted average item score²	Nonpublic	.66	.66	.70	.64	.66	.65	.60	.70	.66	.66	.72	.62	.59	.68	.64	.61	.69	.68	.70	.72	.58
Weighted average polyserial	Public	.63	.70	.69	.62	.66	.64	.69	.71	.61	.57	.63	.64	.59	.66	.56	.67	.57	.60	.63	.66	.57
Weighted average polyserial	Nonpublic	.67	.70	.66	.59	.63	.64	.70	.69	.60	.57	.60	.66	.57	.63	.64	.70	.61	.57	.59	.62	.59
Weighted alpha reliability	Public	.75	.63	.78	.65	.69	.70	.67	.73	.72	.68	.71	.68	.62	.78	.64	.73	.69	.72	.73	.81	.63
Weighted alpha reliability	Nonpublic	.76	.60	.72	.59	.64	.68	.67	.65	.70	.64	.63	.67	.64	.73	.68	.74	.70	.68	.66	.74	.63
Weighted proportion of students attempting last item³	Public	.94	.95	.92	.92	.95	.90	.81	.97	.95	.98	.95	.95	.97	.95	.87	.95	.94	.95	.96	.95	.94
Weighted proportion of students attempting last item³	Nonpublic	.97	.99	.95	.97	.98	.96	.91	.98	.98	.96	.94	.99	.99	.97	.94	.97	.97	.94	.95	.98	.99
¹ Nonpublic school sample includes only private schools, including Catholic schools. ²The "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. ³ 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. In 2014, grades 4 and 12 were not assessed. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2014 TEL Assessment.

Last updated 23 May 2021 (SK)

Printer-friendly Version