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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: 2005
Block-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 8 mathematics combined national and state main assessment: 2005
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 16 16 18 18 16 19 18
Unweighted sample size Public 30,500 30,400 30,500 30,600 30,800 30,600 30,300 30,500 30,300 30,500
Nonpublic 1,400 1,300 1,300 1,300 1,400 1,400 1,400 1,300 1,400 1,400
Weighted average item score Public 0.53 0.60 0.58 0.48 0.49 0.52 0.48 0.50 0.54 0.55
Nonpublic 0.61 0.67 0.65 0.55 0.56 0.60 0.56 0.58 0.60 0.62
Weighted average polyserial Public 0.60 0.62 0.61 0.63 0.58 0.60 0.59 0.61 0.57 0.55
Nonpublic 0.56 0.55 0.60 0.59 0.57 0.58 0.58 0.59 0.56 0.52
Weighted alpha reliability Public 0.76 0.78 0.80 0.79 0.76 0.78 0.79 0.77 0.76 0.75
Nonpublic 0.71 0.72 0.77 0.74 0.74 0.77 0.78 0.74 0.73 0.70
Weighted proportion of students attempting last item2 Public 0.93 0.70 0.89 0.93 0.75 0.86 0.78 0.98 0.94 0.91
Nonpublic 0.96 0.71 0.95 0.97 0.78 0.89 0.83 0.99 0.97 0.95
† 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), 2005 Mathematics Assessment.

Last updated 23 March 2009 (GF)

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