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after 10 weeks, neither group reported a case of the flu. which procedure would have made the outcome of this study more valid?

User Hhamm
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1 Answer

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I think you forgot to give the options along with the question. I am answering the question based on my knowledge and research. "Test a third group that does not receive the supplement" would be the procedure that would have made the outcome of this study more valid. I hope the answer helps you.
User Jkidv
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