A researcher stood in the main lobby of a local fitness center during a busy Saturday morning. They approached the first 40 gym-goers who walked through the entrance and asked them to participate in a quick survey about their weekly hydration habits.
Participants completed a short paper questionnaire asking them to estimate their daily water intake (in litres) and rate their daytime energy levels on a scale of 1 to 10. The gym-goers completed the survey on the spot before continuing with their workout. Apart from this, they were left to go about their normal exercise routines.
Which of the following best describes the sampling method used in this study?
Opportunity sampling
Stratified sampling
Systematic sampling
Volunteer sampling
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.