Table 1.
Descriptive statistics for paper-and-pencil and computer-based speed scores.
| Speed Test | M | SD | Skew | Kurtosis |
|---|---|---|---|---|
| Paper and Pencil | ||||
| Search-Numbers | 275.672 | 44.627 | −0.129 | −0.026 |
| Search-Letters | 288.248 | 46.068 | 0.027 | −0.304 |
| Search-Symbols | 127.960 | 18.006 | 0.508 | 0.050 |
| Comparison-Numbers | 43.968 | 6.670 | 0.171 | −0.335 |
| Comparison-Letters | 39.536 | 6.710 | 0.270 | 0.468 |
| Comparison-Symbols | 30.144 | 5.014 | 0.606 | 0.692 |
| Substitution-Num→Sym | 27.136 | 4.222 | 0.292 | 0.246 |
| Substitution-Let→Num | 29.760 | 4.304 | 0.040 | −0.131 |
| Substitution-Sym→Let | 30.784 | 5.929 | 0.914 | 1.451 |
| Computer Based | ||||
| Search-Numbers | 2.783 | 0.259 | −0.051 | −0.200 |
| Search-Letters | 2.811 | 0.239 | −0.307 | 0.289 |
| Search-Symbols | 2.268 | 0.187 | −0.428 | −0.216 |
| Comparison-Numbers | 1.257 | 0.168 | −0.177 | −0.455 |
| Comparison-Letters | 1.094 | 0.168 | −0.101 | −0.292 |
| Comparison-Symbols | 0.944 | 0.130 | 0.504 | 0.282 |
| Substitution-Num→Sym | 0.808 | 0.131 | 0.597 | 0.503 |
| Substitution-Let→Num | 0.867 | 0.149 | 0.476 | 0.518 |
| Substitution-Sym→Let | 0.917 | 0.121 | 0.281 | 0.486 |
Note. PP scores denote the number of correct responses in the given time (i.e., 45 s per test), whereas CB scores correspond with the number of correct responses per second (1 s/RT).