An agricultural researcher is investigating the effect of a new bio-stimulant (derived from marine microalgae) on the shoot length of hydroponically grown rocket (Eruca sativa).
Formulate both a directional (one-tailed) hypothesis and a non-directional (two-tailed) hypothesis for this study, and distinguish between them by explaining the circumstances under which the researcher would choose to use a directional hypothesis rather than a non-directional hypothesis.
Practise AQA A Level Psychology Scientific processes with exam-style questions for A Level Psychology. 689 questions, matched to the AQA A Level Psychology (7182) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
