Which of the following will provide the most representative sample of UK secondary school pupils in an investigation into attitudes towards environmental issues?
A sample drawn from five GCSE Geography classes in a secondary school
A sample drawn from eight youth clubs located in a single major city
A sample drawn from state secondary schools in four different geographical regions of the United Kingdom
A sample drawn from followers of a young environmental activist group on Instagram
201 exam-style questions on OCR A Level Psychology Planning and conducting research. Each one has a worked solution and a mark scheme showing where the marks go.