Marcus conducted an experiment to investigate whether passers-by are more likely to help an elderly person or a young teenager who has dropped their shopping bags. He allocated 40 participants randomly, with 20 taking part in Condition A (elderly person) and 20 taking part in Condition B (young teenager).
Table 1: Number of participants who helped in each condition
| Condition A (Elderly person) | Condition B (Young teenager) | |
|---|---|---|
| Total number of participants who helped | 16 | 6 |
| Total number of participants who did not help | 4 | 14 |
Identify the experimental design Marcus used.
88 exam-style questions on Edexcel A Level Psychology Research methods and skills, covering Research methods and skills. Each one has a worked solution and a mark scheme showing where the marks go.