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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Scales → Number of Items in Each Subject Area Scale → Number of Items in Scales as Defined Before and After Scaling, Science Combined National and State Assessment: 2015

NAEP Technical DocumentationNumber of Items in Scales as Defined Before and After Scaling, Science Combined National and State Assessment: 2015

Number of items in the univariate scale as defined after scaling, science combined national and state assessment, by grade: 2015
Grade	Total
4	139
8	162
12	180
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Science Assessment.

Number of items in subscales as defined before scaling, science combined national and state assessment, by subscale and grade: 2015
Grade	Total	Physical science	Earth and space sciences	Life science
4	143	48	45	50
8	166	55	64	47
12	187	67	44	76
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Science Assessment.

Number of items in subscales as defined after scaling, science combined national and state assessment, by subscale and grade: 2015
Grade	Total	Physical science	Earth and space sciences	Life science
4	140	46	45	49
8	161	51	64	46
12	181	62	44	75
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Science Assessment.

Last updated 16 November 2021 (ML)

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