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NAEP Technical DocumentationSummary Response Rates for the NAEP 2008 Arts (Visual Arts) Assessment

Summary item response rates, arts (visual arts) assessment, by item type and grade: 2008

Grade	Statistic	Multiple-choice items	Dichotomous constructed-response items	Polytomous constructed-response items
† Not applicable. 1 Missing responses include the categories "omitted" and "not reached." 2 An "off-task" response (constructed-response items only) is a response that is unrelated to the question. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2010 Arts (Visual Arts) Assessment.
8	Number of items	13.00	5.00	26.00
	Average percent missing1	2.70	1.12	3.74
	Minimum	0.45	0.57	0.56
	Maximum	9.75	2.59	18.87
	Average percent off-task2	†	0.16	0.23
	Minimum	†	0.00	0.00
	Maximum	†	0.54	0.97
	Average weighted proportion correct	39.00	67.00	46.00

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