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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 8 U.S. History National Main Assessment (Accommodations Not Permitted [R2]): 2001
Overall descriptive statistics for item blocks as defined after scaling, grade 8 U.S. history national main assessment (accommodations not permitted [R2]): 2001
Statistic Item type Block H3 Block H4 Block H5 Block H6 Block H7 Block H8 Block H9 Block H10 Block H11
Number of scaled items Total 17 16 17 17 16 17 16 16 13
Multiple choice 12 11 12 12 11 11 12 11 6
Dichotomously scored constructed response 1 0 0 0 0 2 0 1 1
Polytomously scored constructed response 4 5 5 5 5 4 4 4 6
Unweighted sample size 2,200 2,300 2,200 2,300 2,200 2,300 2,200 2,300 2,200
Weighted average item score 0.58 0.46 0.44 0.47 0.67 0.65 0.43 0.39 0.45
Weighted average polyserial 0.58 0.55 0.58 0.53 0.56 0.60 0.52 0.51 0.62
Weighted alpha reliability 0.75 0.76 0.76 0.73 0.73 0.76 0.68 0.63 0.76
Weighted proportion of students attempting last item1 0.97 0.97 0.91 0.97 0.94 0.99 0.98 0.89 1.00
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), 2001 U.S. History Assessment.

Last updated 10 July 2008 (GF)

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