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A sports trainer is going to do an experiment on the effect of Vitamin D supplements and his athletes. He randomly assigns all of his

A sports trainer is going to do an experiment on the effect of Vitamin D supplements and his athletes. He randomly assigns all of his patients to either take Vitamin D supplements or take a placebo.

What type of experimental design does this situation illustrate?

Matched-Pair

Randomized Block

Simple Random

Completely Randomized

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