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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 Mathematics Combined National and State Main Assessment: 2003
Overall descriptive statistics for item blocks as defined after scaling, grade 8 mathematics combined national and state main assessment: 2003
Statistic Item type Block M3 Block M4 Block M5 Block M6 Block M7 Block M8 Block M9 Block M10 Block M11 Block M12
Number of scaled items Total 18 20 18 29 19 18 18 18 19 18
Multiple choice 12 7 9 21 14 12 10 10 16 15
Dichotomously scored constructed response 3 5 4 7 3 2 3 7 3 1
Polytomously scored constructed response 3 8 5 1 2 4 5 1 0 2
Unweighted sample size 30,300 30,300 30,500 30,800 30,600 31,100 30,500 30,800 30,200 30,600
Weighted average item score 0.54 0.62 0.59 0.65 0.49 0.52 0.48 0.52 0.54 0.55
Weighted average polyserial 0.60 0.62 0.62 0.59 0.60 0.60 0.58 0.63 0.58 0.56
Weighted alpha reliability 0.76 0.77 0.81 0.85 0.78 0.79 0.80 0.81 0.76 0.75
Weighted proportion of students attempting last item1 0.94 0.70 0.89 0.92 0.90 0.86 0.78 0.86 0.95 0.93
† 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), 2003 Mathematics Assessment.

Last updated 16 February 2009 (GF)

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