Table 2.
Item Set | Difficulty (b)
|
Discrimination (a)
|
||||||
---|---|---|---|---|---|---|---|---|
Mean | SD | Mean | SD | |||||
| ||||||||
3a | 3b | 3a | 3b | 3a | 3b | 3a | 3b | |
1 | −2.35 | −2.44 | 0.28 | 0.20 | 1.63 | 1.48 | 0.36 | 0.33 |
2 | −1.94 | −1.96 | 0.23 | 0.18 | 1.80 | 1.57 | 0.37 | 0.21 |
3 | −1.75 | −1.71 | 0.23 | 0.25 | 1.98 | 1.73 | 0.38 | 0.47 |
4 | −1.57 | −1.67 | 0.16 | 0.34 | 1.92 | 1.77 | 0.53 | 0.74 |
5 | −1.25 | −1.39 | 0.16 | 0.29 | 2.20 | 1.84 | 0.64 | 0.47 |
6 | −1.04 | −1.10 | 0.21 | 0.21 | 2.08 | 1.80 | 0.79 | 0.53 |
7 | −0.88 | −0.97 | 0.12 | 0.32 | 1.91 | 1.93 | 0.66 | 0.84 |
8 | −0.69 | −0.75 | 0.37 | 0.37 | 1.46 | 1.62 | 0.54 | 0.31 |
9 | −0.34 | −0.63 | 0.10 | 0.23 | 1.70 | 1.73 | 0.49 | 0.70 |
10 | −0.25 | −0.37 | 0.22 | 0.39 | 1.58 | 1.70 | 0.52 | 0.66 |
11 | −0.03 | −0.03 | 0.25 | 0.40 | 1.53 | 1.57 | 0.47 | 0.59 |
12 | 0.21 | 0.21 | 0.31 | 0.38 | 1.33 | 1.37 | 0.41 | 0.40 |
13 | 0.46 | 0.60 | 0.22 | 0.26 | 1.38 | 1.55 | 0.41 | 0.47 |
14 | 0.52 | 0.92 | 0.57 | 0.50 | 0.98 | 1.38 | 0.46 | 0.70 |
15 | 1.07 | 1.12 | 0.35 | 0.42 | 1.12 | 1.13 | 0.42 | 0.56 |
16 | 1.67 | 1.45 | 0.48 | 0.60 | 0.68 | 1.00 | 0.31 | 0.35 |
17 | 2.76 | 2.31 | 0.53 | 0.52 | 0.60 | 0.78 | 0.25 | 0.21 |