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(d) A clinical trial was a completely randomized design experiment that assigned 240 patients at
random among four treatment combinations as follows: (i) What is the experimental unit? (ii)
How many factors are in this clinical trial? (iii) What is the name of this experiment, and what is
the necessary assumption to make about the experimental units? Y (iv) Is this a balanced design
of experiment? Yes or No, and why?

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