A developmental psychologist is investigating whether chronological age affects short-term memory capacity.
One group of participants consists of toddlers aged 3 years, and the other group consists of children aged 7 years.
Each participant is tested on a sequential picture-recall task, and their short-term memory capacity is measured by the maximum number of items recalled in the correct sequence.
Explain why an 'independent groups' design is suitable for this investigation.
Practise Edexcel A Level Psychology Methods with exam-style questions for A Level Psychology. 100 questions, matched to the Edexcel A Level Psychology (9PS0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.