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NAEP Analysis and Scaling → Initial Activities → Summaries of Response Rates for NAEP Assessments → Summary Response Rates for the NAEP 2000 Science National Main Assessment (Accommodations Not Permitted [R2])

NAEP Technical DocumentationSummary Response Rates for the NAEP 2000 Science National Main Assessment (Accommodations Not Permitted [R2])

The tables below provide relevant summary statistics for the 2000 science national main assessment (accommodations not permitted [R2]): 2000.

Number of items, by item type and grade, science national main assessment (accommodations not permitted [R2]): 2000

Grade	Multiple-choice items	Dichotomous constructed-response items	Polytomous constructed-response items
4	69	5	68
8	94	4	99
12	91	7	96
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000 Science Assessment.

Average percentage missing, by item type and grade, science national main assessment (accommodations not permitted [R2]): 2000

Grade	Statistic	Multiple-choice items	Dichotomous constructed-response items	Polytomous constructed-response items
4	Average percentage missing	4.18	8.50	11.72
	Minimum	0.44	6.23	0.80
	Maximum	22.28	10.18	41.02
8	Average percentage missing	1.43	22.89	10.15
	Minimum	0.05	7.84	0.66
	Maximum	7.45	53.79	46.64
12	Average percentage missing	1.81	14.39	12.94
	Minimum	0.60	4.99	2.20
	Maximum	11.37	34.39	33.13
NOTE: Missing responses includes the categories "omitted" and "not-reached". SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000 Science Assessment.

Average percentage off-task, by item type and grade, science national main assessment (accommodations not permitted [R2]): 2000

Grade	Statistic	Dichotomous constructed-response items	Polytomous constructed-response items
4	Average percentage off-task	0.03	0.07
	Minimum	0.00	0.00
	Maximum	0.11	0.39
8	Average percentage off-task	0.10	0.17
	Minimum	0.00	0.00
	Maximum	0.27	0.88
12	Average percentage off-task	0.33	0.59
	Minimum	0.00	0.00
	Maximum	1.28	2.60
NOTE: An "off-task" response (constructed-response items only) is a response that is unrelated to the question and is considered inappropriate. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000 Science Assessment.

Average weighted percentage correct, by item type and grade, science national main assessment (accommodations not permitted [R2]): 2000

Grade	Multiple-choice items	Dichotomous constructed-response items	Polytomous constructed-response items
4	53.51	69.33	35.00
8	54.14	22.39	32.47
12	51.96	31.27	34.85
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000 Science Assessment.

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