Table 6 Descriptive statistics for the estimated item difficulty
From: Controlling item difficulty for automatic vocabulary question generation
| Â | P(CTT) | b(IRT) | ||||
|---|---|---|---|---|---|---|
| Â | QS. A | QS. B | QS. C | QS. A | QS. B | QS. C |
n | 40 | 40 | 40 | 39 | 40 | 40 |
x̄ | .491 | .529 | .419 | .296 | 1.278 | −1.720 |
sd | .213 | .228 | .275 | 5.523 | 3.819 | 6.987 |
max | .968 | .964 | .931 | 20 | 10.805 | 15.588 |
min | .065 | .036 | .034 | −15.974 | −5.922 | −20 |