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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 8 Mathematics State Assessment (Accommodations Permitted [R3]): 2000

NAEP Technical DocumentationOverall descriptive statistics for item blocks as defined after scaling, grade 8 mathematics state assessment (accommodations permitted [R3]): 2000

Statistic	Item type	Block M3	Block M4	Block M5	Block M6	Block M7	Block M8	Block M9	Block M10	Block M11	Block M12	Block M13	Block M14	Block M15
Number of Scaled Items	Total	9	21	12	15	10	18	9	9	19	9	11	10	9
	Multiple choice	6	21	7	0	4	16	5	6	13	6	6	6	3
	Dichotomously scored constructed response	0	0	1	14	1	2	3	1	6	0	4	1	1
	Polytomously scored constructed response	3	0	4	1	5	0	1	2	0	3	1	3	5
Unweighted sample size		21,500	21,500	21,500	21,400	21,400	21,400	21,500	21,600	21,500	21,300	21,600	21,600	21,500
Weighted average item score		0.39	0.59	0.56	0.60	0.58	0.52	0.35	0.52	0.64	0.41	0.50	0.45	0.42
Weighted average polyserial		0.58	0.56	0.63	0.69	0.66	0.61	0.62	0.63	0.67	0.66	0.63	0.54	0.70
Weighted alpha reliability		0.53	0.77	0.72	0.82	0.71	0.79	0.61	0.64	0.82	0.63	0.69	0.59	0.72
Weighted proportion of students attempting last item1		0.92	0.87	0.97	0.94	0.82	0.70	0.95	0.94	0.90	0.95	0.98	0.79	0.87
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), 2000 Mathematics Assessment.

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