A company's occupational health department investigated the effectiveness of a new ergonomic vertical mouse designed to reduce wrist strain. They recruited a volunteer sample of 40 software developers from a single department in their London office. 20 of these volunteers were randomly assigned to use the ergonomic mouse for a month, while the remaining 20 continued using a standard mouse. At the end of the month, all 40 participants completed a questionnaire assessing their level of wrist discomfort.
Explain how this study might have been improved by using a stratified sample of employees from the entire international company instead of the original sample.
Practise AQA A Level Psychology Scientific processes with exam-style questions for A Level Psychology. 689 questions, matched to the AQA A Level Psychology (7182) 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.
