Identify any problems that are likely to cause confounding

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A nutritionist wants to conduct a study to validate the efficacy of an herb as an aid in weight loss. She randomly assigns half of a group of overweight persons to a treatment group who are given the herb with instructions as to use and a planned diet for six weeks. The other half of the group is given a placebo with the same instructions and same diet. None of the participants know to which group they belong. The nutritionist weighs each subject on Friday of each week. Identify any problems that are likely to cause confounding.

Reference no: EM132422168

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