Marcus conducted a naturalistic observation on a primary school playground to investigate the imitation of media aggression (Social Learning Theory) among young children. He sat clearly visible on a nearby bench with a clipboard, openly tallying instances of 'rough and aggressive play' among the children.
Explain one improvement that could be made to Marcus's investigation in terms of validity.
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.