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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: 2014

NAEP Technical DocumentationOverall Descriptive Statistics for Assembly Units as Defined After Scaling, Grade 8 Technology and Engineering Literacy (TEL) National Assessment, by Assembly Unit: 2014

Overall descriptive statistics for assembly units as defined after scaling, grade 8 technology and engineering literacy (TEL) national assessment, by assembly unit: 2014
Statistic	Item type	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	Total	12	6	11	10	11	9	8	9	12	12	11	9	11	10	11	10	13	12	13	16	11
	Multiple choice	2	1	3	3	0	1	1	2	4	4	4	2	1	3	5	0	3	4	2	7	2
	Dichtomously scored constructed response	6	1	4	3	9	4	4	4	3	3	3	3	6	0	2	5	5	2	9	7	6
	Polytomously scored constructed response	4	4	4	4	2	4	3	3	5	5	4	4	4	7	4	5	5	6	2	2	3
Unweighted sample size	†	2,000	2,000	2,100	2,000	2,100	2,100	2,000	2,000	2,000	2,000	2,000	2,100	2,000	2,000	2,100	2,100	2,100	2,000	2,100	2,000	2,100
Weighted average item score¹	†	.55	.58	.60	.60	.63	.60	.50	.62	.59	.58	.64	.55	.53	.58	.60	.57	.62	.63	.62	.60	.53
Weighted average polyserial	†	.65	.70	.71	.62	.66	.68	.69	.71	.61	.59	.63	.65	.59	.65	.58	.67	.59	.61	.63	.67	.58
Weighted alpha reliability	†	.76	.63	.79	.65	.69	.70	.67	.73	.72	.64	.71	.68	.63	.74	.65	.73	.70	.72	.74	.82	.63
Weighted proportion of students attempting last item²	†	.94	.96	.92	.92	.95	.90	.82	.97	.95	.98	.95	.96	.97	.95	.87	.95	.95	.95	.96	.95	.94
† Not applicable. ¹The "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. 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. 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 31 August 2021 (ML)

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