A regional transit authority wishes to investigate passenger satisfaction with their new contactless ticketing system. They decide to survey a stratified sample of 180 daily commuters from four different train lines (the Northern, Eastern, Southern, and Western lines). The daily ridership numbers of these lines vary significantly, with some lines being heavily congested and others having much lower passenger volumes.
Explain how the transit authority could obtain a stratified sample of 180 daily commuters from these four train lines.
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.