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NAEP Analysis and Scaling → Initial Activities → Summaries of Response Rates → Summary Response Rates for the NAEP 2005 Science Assessment

NAEP Technical DocumentationSummary Response Rates for the NAEP 2005 Science Assessment

The tables below provide relevant summary statistics for the 2005 science assessment.

Number of items, by item type and grade, science combined national and state main assessment: 2005

Grade	Multiple-choice items	Dichotomous constructed-response items	Polytomous constructed-response items
4	85	5	63
8	126	5	93
12	117	4	85
NOTE: Partially correct answers are reflected in the percentages for polytomous constructed-response 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.

Average percentage missing, by item type and grade, science combined national and state main assessment: 2005

Grade	Statistic	Multiple-choice items	Dichotomous constructed-response items	Polytomous constructed-response items
4	Average percentage missing	3.39	5.42	8.31
	Minimum	.36	3.55	0.50
	Maximum	14.65	7.53	36.31
8	Average percentage missing	1.11	15.81	8.23
	Minimum	0.27	6.12	0.85
	Maximum	5.78	46.89	41.85
12	Average percentage missing	1.49	15.36	10.64
	Minimum	0.47	7.85	1.07
	Maximum	52.87	33.27	37.40
NOTE: Missing responses includes the categories "omitted" and "not-reached". Partially correct answers are reflected in the percentages for polytomous constructed-response 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.

Average percentage off-task, by item type and grade, science combined national and state main assessment: 2005

Grade	Statistic	Dichotomous constructed-response items	Polytomous constructed-response items
4	Average percentage off-task	0.04	0.12
	Minimum	0.03	#
	Maximum	0.04	1.09
8	Average percentage off-task	0.20	0.15
	Minimum	0.12	#
	Maximum	0.28	0.86
12	Average percentage off-task	0.50	0.74
	Minimum	0.04	#
	Maximum	0.95	3.64
# Rounds to zero. NOTE: An "off-task" response (constructed-response items only) is a response that is unrelated to the question and is considered inappropriate. Partially correct answers are reflected in the percentages for polytomous constructed-response 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.

Average weighted percentage correct, by item type and grade, science combined national and state main assessment: 2005

Grade	Multiple-choice items	Dichotomous constructed-response items	Polytomous constructed-response items
4	54.29	70.61	35.99
8	54.96	14.16	38.01
12	52.87	33.27	37.40
NOTE: Partially correct answers are reflected in the percentages for polytomous constructed-response 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.

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