An agricultural scientist is investigating the crop yield of two distinct cultivars of barley, Goldthorpe and Plumage-Archer, grown in separate research fields.
Explain how the scientist could obtain a random sample of 25 Goldthorpe barley plants and a random sample of 25 Plumage-Archer barley plants for nutritional analysis.
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.