A cognitive psychologist wanted to investigate whether workplace background noise affects task concentration.
The psychologist needed a stratified sample of 30 employees. She obtained the sample from a company employing 120 full-time staff and 80 part-time staff.
The participants were asked to complete a complex proofreading task. There were two conditions in the study, Condition A and Condition B:
There were 15 participants in each condition. The psychologist recorded the time taken (in minutes) to complete the proofreading task and the number of errors made.
The psychologist wanted to randomly allocate the 30 employees in her stratified sample to the two conditions. She needed an equal number of full-time employees in each condition (9 in each) and an equal number of part-time employees in each condition (6 in each).
Explain how she would have done this.
689 exam-style questions on AQA A Level Psychology Scientific processes. Each one has a worked solution and a mark scheme showing where the marks go.