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Question: Consider the situation of. Suppose a colleague faced with a similar physical problem says "We do not need to change levels of both factors at once. The scientific way to proceed is to experiment one factor at a time. We'll hold the cooling method fixed and change antimony level to see the antimony effect. Then we'll hold antimony level fixed and change cooling method in order to see the cooling method effect." What do you have to say to this person?

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