NAEP Analysis and Scaling - Overall Descriptive Statistics for Items as Defined After Scaling, Grade 12 Mathematics Combined National and State Main Assessment: 2009

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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Items as Defined After Scaling, Grade 12 Mathematics Combined National and State Main Assessment: 2009

NAEP Technical DocumentationOverall descriptive statistics for items as defined after scaling, grade 12 mathematics combined national and state main assessment: 2009
Statistic	Item type	Block M1	Block M2	Block M3	Block M4	Block M5	Block M6	Block M7	Block M8	Block M9	Block M10	Block M11	Block M12	Block M13	Block M14	Block M15	Block M16	Block M17	Block M18	Block M19	Block M20	Block M21	Block M22
† Not applicable. ¹ The "Weighted proportion of students attempting last item" is equal to 1 - (Percent not responding to last item /100). ² Common blocks M13-M22 were previously named M3-M12 in 2005. 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), 2009 Mathematics Assessment.
Number of scaled items	Total	14	14	14	14	13	14	13	13	13	13	14	14	17	17	18	17	18	21	18	18	18	18
	Multiple choice	9	9	9	8	9	10	8	8	10	8	9	10	12	11	11	14	13	10	7	11	15	15
	Dichtomously scored constructed response	1	1	2	1	1	1	1	1	1	0	3	2	1	2	4	1	0	4	5	5	2	1
	Polytomously scored constructed response	4	4	3	5	3	3	4	4	2	5	2	2	4	4	3	2	5	7	6	2	1	2
Unweighted sample size	†	6,400	6,300	6,400	6,400	6,400	6,300	6,400	6,300	6,300	6,400	6,400	6,300	2,200	2,200	2,200	2,000	2,200	2,100	2,100	2,200	2,200	2,100
Weighted average item score	†	0.41	0.39	0.39	0.37	0.41	0.42	0.43	0.42	0.48	0.41	0.42	0.39	0.49	0.48	0.46	0.42	0.50	0.49	0.42	0.47	0.47	0.46
Weighted average polyserial	†	0.62	0.62	0.63	0.67	0.66	0.64	0.71	0.71	0.67	0.67	0.65	0.63	0.62	0.61	0.59	0.65	0.62	0.63	0.68	0.64	0.61	0.60
Weighted alpha reliability	†	0.72	0.73	0.71	0.78	0.77	0.73	0.80	0.81	0.78	0.76	0.74	0.71	0.80	0.77	0.77	0.79	0.81	0.80	0.83	0.79	0.79	0.78
Weighted proportion of students attempting last item¹	†	0.82	0.88	0.67	0.92	0.97	0.94	0.85	0.84	0.95	0.95	0.96	0.97	0.88	0.93	0.89	0.91	0.88	0.69	0.71	0.91	0.98	0.95

Last updated 05 January 2016 (GF)

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