Table of Contents | Search Technical Documentation | References
Statistic | Type of school1 | Block S3 | Block S4 | Block S6 | Block S7 | Block S8 | Block S9 | Block S10 | Block S11 | Block S12 | Block S13 | Block S14 | Block S15 | Block S20 | Block S21 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Number of scaled items | † | 6 | 7 | 4 | 10 | 15 | 8 | 11 | 14 | 11 | 11 | 10 | 9 | 14 | 11 |
Unweighted sample size | Public | 1,400 | 1,400 | 1,200 | 1,900 | 2,000 | 2,000 | 1,500 | 1,500 | 1,500 | 1,500 | 2,000 | 1,500 | 1,400 | 1,500 |
Nonpublic | 1,000 | 1,100 | 1,000 | 1,400 | 1,300 | 1,500 | 1,100 | 1,100 | 1,000 | 1,000 | 1,400 | 1,100 | 1,100 | 1,100 | |
Weighted average item score | Public | 0.37 | 0.47 | 0.50 | 0.45 | 0.47 | 0.36 | 0.44 | 0.49 | 0.48 | 0.53 | 0.31 | 0.31 | 0.49 | 0.45 |
Nonpublic | 0.43 | 0.50 | 0.54 | 0.52 | 0.54 | 0.40 | 0.52 | 0.53 | 0.55 | 0.59 | 0.36 | 0.35 | 0.54 | 0.51 | |
Weighted alpha reliability | Public | 0.54 | 0.53 | 0.65 | 0.68 | 0.63 | 0.58 | 0.70 | 0.63 | 0.69 | 0.59 | 0.52 | 0.56 | 0.62 | 0.66 |
Nonpublic | 0.48 | 0.47 | 0.58 | 0.63 | 0.58 | 0.55 | 0.66 | 0.54 | 0.63 | 0.47 | 0.49 | 0.53 | 0.58 | 0.58 | |
Weighted average polyserial | Public | 0.65 | 0.71 | 0.78 | 0.59 | 0.53 | 0.64 | 0.61 | 0.52 | 0.61 | 0.54 | 0.55 | 0.62 | 0.50 | 0.61 |
Nonpublic | 0.62 | 0.68 | 0.73 | 0.57 | 0.51 | 0.61 | 0.58 | 0.48 | 0.59 | 0.50 | 0.52 | 0.60 | 0.48 | 0.57 | |
Weighted proportion of students attempting last item2 | Public | 0.76 | 0.83 | 0.67 | 0.85 | 0.86 | 0.81 | 0.87 | 0.81 | 0.65 | 0.91 | 0.84 | 0.82 | 0.77 | 0.63 |
Nonpublic | 0.89 | 0.88 | 0.79 | 0.92 | 0.93 | 0.88 | 0.94 | 0.91 | 0.78 | 0.97 | 0.89 | 0.89 | 0.86 | 0.76 | |
† 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 Science Assessment. |