A statistician designs an experiment that tests the effectiveness of a drug. Which process can invalidate the results of the exp
eriment?
A. assigning subjects a unique identification number
B. assigning subjects into groups using a randomized process
C. selecting subjects in favor of the treatment
D. selecting subjects randomly for a control group
1 answer:
I think the answer is D not too sure tho
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Answer:
Option A
Step-by-step explanation:
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