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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 Science State Assessment (Accommodations Permitted [R3]): 2000

NAEP Technical DocumentationOverall descriptive statistics for item blocks as defined after scaling, grade 4 science state assessment (accommodations permitted [R3]): 2000

Statistic	Item type	Block S3	Block S4	Block S6	Block S7	Block S8	Block S9	Block S10	Block S11	Block S12	Block S13	Block S14	Block S15	Block S20	Block S21
Number of Scaled Items	Total	6	7	4	10	15	8	11	14	11	11	10	9	14	11
	Multiple choice	0	1	0	2	13	1	6	10	6	6	5	3	10	5
	Dichotomously scored constructed response	1	5	1	4	2	3	1	1	0	2	1	0	0	1
	Polytomously scored constructed response	5	1	3	4	0	4	4	3	5	3	4	6	4	5
Unweighted sample size		14,900	14,700	13,700	20,000	20,000	20,100	14,900	15,100	15,100	15,300	20,100	15,000	15,300	15,100
Weighted average item score		0.38	0.47	0.51	0.45	0.46	0.33	0.44	0.47	0.48	0.51	0.31	0.30	0.48	0.45
Weighted average polyserial		0.64	0.68	0.76	0.59	0.52	0.65	0.60	0.52	0.61	0.57	0.54	0.61	0.51	0.59
Weighted alpha reliability		0.53	0.49	0.62	0.68	0.63	0.60	0.69	0.64	0.68	0.64	0.50	0.53	0.63	0.65
Weighted proportion of students attempting last item1		0.82	0.86	0.73	0.87	0.88	0.84	0.87	0.85	0.67	0.91	0.85	0.83	0.78	0.66
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 Science Assessment.

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