NAEP Analysis and Scaling - Block-Level Descriptive Statistics by Public- and Nonpublic-School Sessions, as Defined After Scaling, Grade 8 Science Combined National and State Main Assessment: 2005

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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 8 Science Combined National and State Main Assessment: 2005

NAEP Technical DocumentationBlock-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 8 science combined national and state main assessment: 2005
Statistic	Type of school¹	Block S3	Block S4	Block S5	Block S6	Block S7	Block S8	Block S9	Block S10	Block S11	Block S12	Block S13	Block S14	Block S15	Block S16	Block S17	Block S18
Number of scaled items	†	6	18	8	7	17	9	13	19	15	14	15	15	17	14	18	18
Unweighted sample size	Public	20,500	19,000	20,300	20,900	28,500	28,800	28,700	19,500	19,700	19,100	19,100	19,000	18,900	19,000	19,000	19,000
Unweighted sample size	Nonpublic	400	400	400	400	500	600	600	400	400	400	300	400	400	400	400	400
Weighted average item score	Public	0.48	0.41	0.46	0.38	0.46	0.57	0.54	0.49	0.36	0.41	0.47	0.39	0.51	0.46	0.53	0.47
Weighted average item score	Nonpublic	0.56	0.48	0.55	0.42	0.53	0.66	0.62	0.55	0.42	0.47	0.54	0.43	0.57	0.53	0.61	0.54
Weighted average polyserial	Public	0.74	0.49	0.79	0.81	0.52	0.72	0.62	0.53	0.55	0.50	0.56	0.55	0.53	0.55	0.53	0.52
Weighted average polyserial	Nonpublic	0.71	0.48	0.78	0.74	0.52	0.67	0.57	0.52	0.53	0.47	0.56	0.53	0.49	0.53	0.51	0.50
Weighted alpha reliability	Public	0.70	0.66	0.73	0.50	0.66	0.65	0.72	0.74	0.70	0.63	0.72	0.70	0.73	0.69	0.75	0.75
Weighted alpha reliability	Nonpublic	0.66	0.62	0.73	0.44	0.65	0.53	0.61	0.72	0.66	0.58	0.70	0.67	0.63	0.68	0.70	0.73
Weighted proportion of students attempting last item²	Public	0.76	0.93	0.54	0.84	0.84	0.95	0.96	0.97	0.98	0.90	0.95	0.82	0.96	0.99	0.98	0.91
Weighted proportion of students attempting last item²	Nonpublic	0.81	0.95	0.67	0.92	0.93	0.97	0.98	0.98	0.98	0.95	0.96	0.92	0.98	1.00	0.99	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), 2005 Science Assessment.

Last updated 23 March 2009 (GF)

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