NAEP Analysis and Scaling - Block-Level Descriptive Statistics by Public- and Nonpublic-School Sessions, as Defined After Scaling, Grade 12 Science National Main Assessment (Accommodations Permitted [R3]): 2000

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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 Science National Main Assessment (Accommodations Permitted [R3]): 2000

NAEP Technical DocumentationBlock-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 12 science national main assessment (accommodations permitted [R3]): 2000
Statistic	Type of school¹	Block S3	Block S5	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	†	6	8	8	19	10	14	20	16	16	15	16	8	20	16
Unweighted sample size	Public	1,300	1,300	1,300	1,900	1,800	1,900	1,400	1,400	1,400	1,400	1,900	1,400	1,400	1,400
Unweighted sample size	Nonpublic	1,000	1,000	1,000	1,500	1,400	1,400	1,100	1,100	1,100	1,100	1,400	1,000	1,000	1,100
Weighted average item score	Public	0.47	0.53	0.47	0.37	0.65	0.45	0.45	0.43	0.47	0.49	0.37	0.19	0.38	0.40
Weighted average item score	Nonpublic	0.53	0.61	0.58	0.41	0.71	0.53	0.65	0.50	0.53	0.56	0.44	0.23	0.44	0.47
Weighted alpha reliability	Public	0.58	0.73	0.80	0.67	0.61	0.80	0.65	0.66	0.76	0.69	0.71	0.59	0.72	0.69
Weighted alpha reliability	Nonpublic	0.53	0.72	0.78	0.68	0.54	0.77	0.62	0.65	0.65	0.61	0.71	0.56	0.69	0.68
Weighted average polyserial	Public	0.81	0.79	0.81	0.50	0.71	0.66	0.47	0.47	0.57	0.54	0.56	0.71	0.52	0.56
Weighted average polyserial	Nonpublic	0.79	0.78	0.79	0.51	0.64	0.63	0.44	0.49	0.50	0.51	0.56	0.66	0.50	0.54
Weighted proportion of students attempting last item²	Public	0.87	0.69	0.80	0.86	0.94	0.89	0.96	0.95	0.81	0.89	0.86	0.84	0.98	0.89
Weighted proportion of students attempting last item²	Nonpublic	0.88	0.77	0.89	0.93	0.95	0.89	0.96	0.97	0.89	0.97	0.91	0.88	0.98	0.95
† 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), 2000 Science Assessment.

Last updated 11 July 2008 (DB)

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