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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics as Defined After Scaling, Grade 8 Mathematics Combined National and State Main Assessment, by Public and Nonpublic School Sessions: 2007

NAEP Technical DocumentationBlock-level descriptive statistics as defined after scaling, grade 8 mathematics combined national and state main assessment, by public and nonpublic school sessions: 2007

Statistic	Type of school	Block M3	Block M4	Block M5	Block M6	Block M7	Block M8	Block M9	Block M10	Block M11	Block M12
† Not applicable. 1 The "Weighted proportion of students attempting last item" is equal to 1 - (Percent not responding to last item /100). NOTE: Nonpublic school samples include only Private and Catholic schools. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2007 Mathematics Assessment.
Number of scaled items	†	15	14	18	16	16	18	18	16	19	17
Unweighted sample size	Public	29,800	29,800	29,900	29,900	30,200	30,200	29,900	30,100	30,000	29,900
	Nonpublic	600	600	600	600	600	700	600	600	600	600
Weighted average item score	Public	0.45	0.43	0.60	0.50	0.50	0.53	0.47	0.51	0.54	0.48
	Nonpublic	0.54	0.50	0.66	0.57	0.57	0.60	0.54	0.58	0.59	0.54
Weighted average polyserial	Public	0.63	0.64	0.62	0.65	0.59	0.60	0.59	0.61	0.58	0.59
	Nonpublic	0.62	0.65	0.63	0.60	0.51	0.61	0.59	0.61	0.56	0.59
Weighted alpha reliability	Public	0.77	0.77	0.80	0.80	0.76	0.79	0.80	0.78	0.76	0.77
	Nonpublic	0.77	0.78	0.80	0.75	0.67	0.79	0.78	0.76	0.73	0.76
Weighted proportion of students attempting last item1	Public	0.92	0.95	0.86	0.94	0.76	0.87	0.79	0.98	0.94	0.97
	Nonpublic	0.93	0.95	0.93	0.96	0.80	0.91	0.83	0.99	0.97	0.98

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