When you have a cold, friends and family will often tell you to take your medication and drink plenty of fluids. A study

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When you have a cold, friends and family will often tell you to
take your medication and drink plenty of fluids. A study should be
conducted to determine the effect of three drinks (orange juice,
hot tea, or ginger ale) and two cough syrups (Buckley's or
Robitussin) in the recovery time of cold sufferers. The Researchers
locate 90 cold sufferers who will participate in the
experiment.
a) Identify each of the following options for this experiment:
i) experimental units ii) factors iii) factor levels iv) treatments
v) response variable You have been asked to design an experiment to
achieve the objectives of the study.
b) Draw a diagram of your proposed experiment. What kind of
experiment is it?
c) How is randomization used in this experiment? Because it is
important?
d) How does the replication principle enter the experiment?