A health researcher wanted to investigate whether a new high-intensity interval training (HIIT) mobile application improves cardiovascular fitness more than a standard running application.
To recruit participants, the researcher stood outside a premium strength-and-conditioning CrossFit gym at 6:00 AM on a Tuesday morning and selected the first 30 gym-goers who agreed to participate.
All participants were asked to maintain their usual sleep and dietary habits for the 4-week duration of the study. At the end of the 4 weeks, all participants completed a standardised treadmill endurance test to measure their cardiovascular fitness level.
Identify the sampling method used in this study. Explain one limitation of using this sampling method in this investigation.
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.
