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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics by Public- and Nonpublic-School Sessions, as Defined After Scaling, Grade 8 Mathematics National Main Assessment (Accommodations Not Permitted [R2]): 2000
Block-level descriptive statistics by public- and nonpublic-school sessions as defined after scaling, grade 8 mathematics national main assessment (accommodations not permitted [R2]): 2000
Statistic Type of school1 Block M3 Block M4 Block M5 Block M6 Block M7 Block M8 Block M9 Block M10 Block M11 Block M12 Block M13 Block M14 Block M15
Number of scaled items 9 21 12 15 10 18 9 9 19 9 11 10 9
Unweighted sample size Public 2,100 2,100 2,100 2,100 2,100 2,200 2,200 2,100 2,200 2,200 2,100 2,200 2,200
Nonpublic 1,500 1,400 1,500 1,500 1,400 1,500 1,500 1,500 1,500 1,500 1,500 1,500 1,500
Weighted average item score Public 0.40 0.61 0.57 0.60 0.58 0.53 0.36 0.54 0.66 0.45 0.52 0.46 0.42
Nonpublic 0.45 0.65 0.61 0.66 0.64 0.58 0.41 0.59 0.71 0.48 0.58 0.52 0.48
Weighted average polyserial Public 0.58 0.56 0.62 0.67 0.66 0.62 0.63 0.62 0.68 0.67 0.63 0.53 0.70
Nonpublic 0.56 0.54 0.60 0.64 0.64 0.59 0.58 0.62 0.64 0.64 0.63 0.55 0.67
Weighted alpha reliability Public 0.53 0.78 0.70 0.81 0.70 0.79 0.63 0.63 0.81 0.65 0.70 0.59 0.73
Nonpublic 0.48 0.74 0.69 0.77 0.67 0.78 0.58 0.63 0.78 0.60 0.68 0.61 0.70
Weighted proportion of students attempting last item2 Public 0.93 0.87 0.96 0.94 0.83 0.71 0.94 0.94 0.91 0.95 0.98 0.80 0.88
Nonpublic 0.94 0.89 0.97 0.97 0.84 0.71 0.99 0.96 0.89 0.97 0.99 0.77 0.89
† Not applicable.
1 Nonpublic-school sample includes only Catholic and private schools.
2 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), 2000 Mathematics Assessment.

Last updated 11 July 2008 (DB)

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