math statistics
posted by Please help .
Marathon runners were randomly assigned to receive either vitamin C or a placebo.
Separately, these treatments were also randomly assigned to a group of nonrunners the same age as the runners. All subjects were watched for 2 weeks after the race to see if infections developed.
1. What is the name for this experimental design? I think it is either randomized comparative design or compeltely randomized design. Can you please explain and help me out? Thank you

Could it be a block design?
Thank you 
Yes.
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