An agricultural technology company wants to study the yield performance of a new drought-resistant crop variety across three distinct soil zones (Sandy Loam, Clay, and Silt) in an experimental agricultural region. The total number of crop plants currently growing in each soil zone varies significantly.
Explain how the company could obtain a stratified sample of 180 crop plants from the three soil zones.
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.