Dr. Aris is investigating whether there is a relationship between daily caffeine consumption (measured in milligrams) and self-reported sleep quality (rated on a scale of 0 to 100). To recruit participants, he posts an invitation link on a popular online video gaming forum, asking users to click through and complete his digital questionnaire. Thirty participants complete the online survey.
Explain one strength and one weakness of using this sampling method for Dr. Aris's study.
638 exam-style questions on Edexcel A Level Psychology Methods. Each one has a worked solution and a mark scheme showing where the marks go.