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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 4 Mathematics State Assessment (Accommodations Not Permitted [R2]): 2000

NAEP Technical DocumentationOverall descriptive statistics for item blocks as defined after scaling, grade 4 mathematics state assessment (accommodations not permitted [R2]): 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	13	14	10	11	8	15	10	6	16	10	10	10	10
	Multiple choice	9	14	4	0	3	14	7	3	11	7	6	4	3
	Dichotomously scored constructed response	4	0	0	11	2	1	0	1	5	0	2	0	2
	Polytomously scored constructed response	0	0	6	0	3	0	3	2	0	3	2	6	5
Unweighted sample size		21,700	21,900	21,800	21,900	21,900	21,900	21,700	21,900	21,900	21,800	21,800	21,800	21,800
Weighted average item score		0.50	0.45	0.47	0.45	0.35	0.59	0.52	0.43	0.51	0.50	0.59	0.47	0.44
Weighted average polyserial		0.61	0.53	0.67	0.68	0.68	0.56	0.63	0.65	0.59	0.60	0.65	0.67	0.68
Weighted alpha reliability		0.69	0.62	0.74	0.73	0.65	0.71	0.67	0.50	0.76	0.64	0.66	0.70	0.76
Weighted proportion of students attempting last item1		0.84	0.94	0.90	0.88	0.88	0.85	0.97	0.97	0.90	0.88	0.95	0.72	0.90
1The "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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