An agricultural scientist wants to investigate the effect of a new dietary probiotic supplement on the milk production of dairy cows. He recruits 30 Holstein cows and randomly assigns them to two groups. Group A's daily feed is supplemented with 50g of the probiotic, while Group B receives a standard daily feed with 0g of the probiotic. After a four-week trial period, the daily milk yield (measured in litres) of each cow is recorded.
Write a suitable directional hypothesis for this investigation.
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.
