Answer:
When the control subject's medial hypothalamus is treated with norepinephrine (NE), it has to be ensured that no other variable is changed. Redesign the experiment such that the eating and sleeping patterns of all the subjects should be similar so that confounding variables can be eliminated.
Step-by-step explanation:
In case of the control experiment, all the factors are held constant and only the independent variable is changed so as to validate the changes that occur in the experimental subject.