Practise Edexcel Psychology questions comparing independent and repeated measures designs, applying participant allocation, order effects and demand characteristics.
Kaleb investigated the effect of leading questions on eyewitness recall. He showed a video clip to 30 participants and then asked them three questions about what they had seen in the video clip. The experimental group was asked the same three leading questions, the control group was not asked any leading questions.
The results are shown in Table 3.
Table 3
Describe why Kaleb chose to use an independent groups design for his investigation.