A researcher investigated whether congenital amusia (tone deafness) affects a person's spatial reasoning abilities. Participants with congenital amusia and a control group of typical perceivers were timed (in seconds) while completing a complex 3D mental rotation task.
The mean times are shown in Table 1 below.
Table 1: Mean time taken to complete the mental rotation task (seconds)
| Group | Mean completion time (seconds) |
|---|---|
| Congenital amusia | 5.6 |
| Control | 3.9 |
State why an 'independent groups' design is suitable for this investigation.
638 exam-style questions on Edexcel A Level Psychology Methods. Each one has a worked solution and a mark scheme showing where the marks go.