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Statistic | Type of school1 | Block G3 | Block G4 | Block G5 | Block G6 | Block G7 | Block G8 | Block G9 |
---|---|---|---|---|---|---|---|---|
Number of scaled items | † | 17 | 16 | 16 | 16 | 14 | 17 | 25 |
Unweighted sample size | Public | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 1,900 |
Nonpublic | 240 | 240 | 220 | 230 | 230 | 240 | 240 | |
Weighted average item score2 | Public | .48 | .51 | .50 | .41 | .56 | .46 | .54 |
Nonpublic | .55 | .58 | .60 | .49 | .65 | .54 | .60 | |
Weighted average polyserial | Public | .56 | .51 | .51 | .51 | .60 | .48 | .52 |
Nonpublic | .56 | .50 | .49 | .47 | .62 | .48 | .51 | |
Weighted alpha reliability | Public | .73 | .70 | .71 | .72 | .74 | .67 | .80 |
Nonpublic | .74 | .67 | .64 | .68 | .73 | .68 | .76 | |
Weighted proportion of students attempting last item3 | Public | .96 | .93 | .90 | .86 | .72 | .90 | .98 |
Nonpublic | .96 | .98 | .95 | .87 | .81 | .93 | 1.00 | |
† Not applicable. |