To investigate the impact of an advanced flight-deck interface, an aviation psychologist measured the performance of trainee pilots in a high-fidelity flight simulator. Twelve trainees were recruited via a voluntary participation scheme. In the first phase, participants completed a standard landing sequence and recorded the number of flight path deviations they committed (Standard Display). In the second phase, the simulator's Heads-Up Display (HUD) upgrade was activated, and the same trainees repeated the sequence, recording their deviations again (With HUD). The results are shown in the table below.
| Trainee | Number of flight path deviations during the landing sequence | |
|---|---|---|
| Standard Display | With HUD | |
| T1 | 14 | 8 |
| T2 | 18 | 14 |
| T3 | 15 | 11 |
| T4 | 10 | 5 |
| T5 | 17 | 12 |
| T6 | 8 | 3 |
| T7 | 21 | 15 |
| T8 | 13 | 9 |
| T9 | 11 | 7 |
| T10 | 16 | 11 |
| T11 | 9 | 4 |
| T12 | 14 | 10 |
Calculate the median and range for the number of deviations committed in the phase with the Heads-Up Display (HUD) upgrade. Show your workings.
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.