Marcus is interested in finding out if there is a relationship between daily smartphone screen-time and levels of anxiety. To investigate this, he pins flyers on noticeboards around a local fitness center, asking for volunteers to scan a QR code to complete an online survey. Fifteen participants completed his survey, providing self-report data on their average daily screen-time (in hours) and their anxiety levels rated on a scale of 0 to 50.
Explain one strength and one weakness of using this sampling method for Marcus's study.
Practise Edexcel A Level Psychology Methods with exam-style questions for A Level Psychology. 638 questions, matched to the Edexcel A Level Psychology (9PS0) 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.