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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics by Public- and Nonpublic-School Sessions, as Defined After Scaling, Grade 12 U.S. History National Main Assessment (Accommodations Not Permitted [R2]): 2001

NAEP Technical DocumentationBlock-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 12 U.S. history national main assessment (accommodations not permitted [R2]): 2001

Statistic	Type of school1	Block H3	Block H4	Block H5	Block H6	Block H7	Block H8	Block H9	Block H10	Block H11
Number of scaled items	†	17	18	18	17	16	17	16	16	16
Unweighted sample size	Public	2,000	2,000	2,000	2,000	2,000	2,000	2,000	2,000	2,000
	Nonpublic	300	300	200	200	300	300	200	300	300
Weighted average item score	Public	0.43	0.41	0.46	0.42	0.45	0.46	0.54	0.48	0.56
	Nonpublic	0.49	0.49	0.55	0.45	0.52	0.52	0.65	0.55	0.60
Weighted average polyserial	Public	0.56	0.56	0.53	0.56	0.58	0.56	0.56	0.56	0.67
	Nonpublic	0.56	0.56	0.51	0.50	0.62	0.55	0.59	0.53	0.63
Weighted alpha reliability	Public	0.76	0.77	0.76	0.74	0.76	0.76	0.74	0.71	0.84
	Nonpublic	0.75	0.77	0.74	0.66	0.80	0.75	0.77	0.67	0.82
Weighted proportion of students attempting last item2	Public	0.94	0.88	0.96	0.98	0.98	0.97	0.99	0.94	0.91
	Nonpublic	0.97	0.88	0.98	0.98	0.94	0.97	1.00	0.96	0.96
† Not applicable. 1 Nonpublic-school sample includes only Catholic and private schools. 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. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2001 U.S. History Assessment.

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