A researcher investigated the 'weapon focus effect' to see if the presence of a weapon affects the number of details recalled from a crime scene video. Two separate groups of participants were used. Group 1 watched a video with a weapon present, and Group 2 watched a video with no weapon present.
Table 2: Mean recall scores out of 20 for the two groups
| Weapon Present | No Weapon | |
|---|---|---|
| Mean score out of 20 | 11.4 | 15.8 |
Explain which statistical test the researchers could have used to analyse the data in Table 2.
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.