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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 Combined National and State Main Assessment: 2003
Block-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 8 mathematics combined national and state main assessment: 2003
Statistic Type of school1 Block M3  Block M4  Block M5  Block M6  Block M7  Block M8  Block M9  Block M10  Block M11  Block M12 
Number of scaled items 18 20 18 29 19 18 18 18 19 18
Unweighted sample size Public 29,200 29,200 29,400 29,700 29,500 30,000 29,400 29,700 29,100 29,500
Nonpublic 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000
Weighted average item score Public 0.53 0.61 0.58 0.64 0.48 0.51 0.47 0.51 0.53 0.54
Nonpublic 0.60 0.67 0.66 0.70 0.57 0.59 0.57 0.60 0.60 0.60
Weighted average polyserial Public 0.60 0.62 0.62 0.59 0.59 0.60 0.58 0.63 0.57 0.56
Nonpublic 0.57 0.53 0.59 0.57 0.59 0.61 0.56 0.60 0.58 0.55
Weighted alpha reliability Public 0.76 0.78 0.81 0.85 0.78 0.78 0.79 0.81 0.76 0.75
Nonpublic 0.73 0.71 0.76 0.81 0.77 0.79 0.76 0.79 0.74 0.73
Weighted proportion of students attempting last item2 Public 0.93 0.69 0.88 0.92 0.90 0.85 0.77 0.85 0.95 0.92
Nonpublic 0.96 0.73 0.94 0.98 0.95 0.90 0.86 0.91 0.96 0.97
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), 2003 Mathematics Assessment.

Last updated 16 February 2009 (GF)

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