The experimental units are what you apply the treatments to. Describe them carefully. It is helpful to note how many there are. For example (the dots denote missing technical details)
(this is 60 experiemental units if treatments can be changed daily)
The waking experiment is small. I suggest ignoring the older students and then choosing students all of the same sex. If you find that the two pills affect young student women differently then you might plan further experiments with men and women, students and non-students, of various ages. In either case, the choice of alike experimental units or representative experimental units should be deliberate. Do not choose them at random.
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