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A nutritionist wants to conduct a study to validate the efficacy.T of an herb as an She randome assigns half of a group of overweight

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A nutritionist wants to conduct a study to validate the efficacy.T of an herb as an She randome assigns half of a group of overweight persons to a treatment grou the herb with instructions for its use and a planned diet for sis weeks. The other is given {hassle}.r with the same instructions and same diet. A nurse at the uuuitio each subject on Friday,r of each week. Select the potenal SULIICE of confounding

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