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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 12 Civics National Main Assessment: 2006
Overall descriptive statistics for item blocks as defined after scaling, grade 12 civics national main assessment: 2006
Statistic Item type Block C3 Block C4 Block C5 Block C6 Block C7 Block C8 Block C9 Block C10
Number of scaled items      Total 19 19 19 18 19 19 19 19
Multiple choice 15 16 15 15 15 15 15 15
Dichotomously scored constructed response 0 1 1 1 0 0 0 0
Polytomously scored constructed response 4 2 3 2 4 4 4 4
Unweighted sample size 2,300 2,300 2,200 2,300 2,300 2,300 2,300 2,300
Weighted average item score 0.52 0.56 0.52 0.56 0.48 0.52 0.59 0.56
Weighted average polyserial 0.62 0.55 0.57 0.57 0.56 0.58 0.60 0.56
Weighted alpha reliability 0.83 0.75 0.80 0.76 0.79 0.80 0.82 0.78
Weighted proportion of students attempting last item1 0.93 0.97 0.84 0.96 0.93 0.92 0.95 0.95
† Not applicable.
1  The "Weighted proportion of students attempting last item" is equal to 1 - (Percent not responding to last item /100).
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), 2006 Civics Assessment.

Last updated 23 June 2010 (GF)

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National Center for Education Statistics - http://nces.ed.gov
U.S. Department of Education