A botanist is conducting an experiment to evaluate the effect of three organic soil amendments on the root mass development of Arabidopsis thaliana seedlings.
A sample of 90 genetically identical seedlings is prepared. The botanist wishes to distribute these 90 seedlings equally among three treatment groups (with 30 seedlings in each group):
Explain one way in which the botanist could randomly allocate the 90 seedlings to the three treatment groups.
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.