Dr. Beatrice conducted an experiment to investigate the effect of cognitive load on problem-solving speed. She used a repeated measures design where 18 participants solved a set of 10 complex logical puzzles while listening to a continuous spoken-word podcast. Immediately afterward, the same 18 participants were asked to solve the exact same 10 logical puzzles in complete silence.
Explain one way in which Dr. Beatrice could have improved this investigation.
186 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.