Block-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 8 geography national main assessment (accommodations not permitted [R2]): 2001
Statistic |
Type of school1 |
Block G3 |
Block G4 |
Block G5 |
Block G6 |
Block G7 |
Block G8 |
Block G9 |
Number of scaled items |
† |
17 |
16 |
17 |
16 |
14 |
17 |
25 |
Unweighted sample size |
Public |
1,900 |
1,900 |
1,900 |
1,900 |
1,900 |
1,900 |
2,000 |
Nonpublic |
300 |
300 |
300 |
300 |
300 |
300 |
300 |
Weighted average item score |
Public |
0.49 |
0.52 |
0.49 |
0.40 |
0.44 |
0.67 |
0.50 |
Nonpublic |
0.57 |
0.59 |
0.55 |
0.46 |
0.51 |
0.74 |
0.56 |
Weighted average polyserial |
Public |
0.57 |
0.50 |
0.61 |
0.49 |
0.58 |
0.61 |
0.53 |
Nonpublic |
0.57 |
0.48 |
0.55 |
0.48 |
0.57 |
0.59 |
0.49 |
Weighted alpha reliability |
Public |
0.76 |
0.68 |
0.78 |
0.69 |
0.73 |
0.76 |
0.80 |
Nonpublic |
0.75 |
0.62 |
0.71 |
0.67 |
0.73 |
0.68 |
0.75 |
Weighted proportion of students attempting last item2 |
Public |
0.98 |
0.96 |
0.96 |
0.91 |
0.73 |
0.93 |
0.99 |
Nonpublic |
0.99 |
0.99 |
0.97 |
0.88 |
0.70 |
0.99 |
0.99 |
Last updated 10 July 2008 (GF)
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