A study claims that the combination of vitamin C with vitamin E is more effective for preventing the flu than vitamin C alone. In the study, a group of researchers studied 1132 subjects. The subjects were randomly assigned to out of three study groups. The first group of 310 subjects were instructed to take 600 mg daily of vitamin C. The second group of 418 subjects were instructed to take 600 mg of vitamin C and 200 IU of vitamin E daily. The third group of 404 subjects were instructed to take 600 mg of vitamin C and 400 IU of vitamin E daily. The incidence of flu over a season was recorded. All subjects knew which treatment they were receiving. In this study, which is the control group? Othe first group of 310 taking vitamin C alone the 1132 subjects the third group of 404 taking 400 IU of vitamin E the second group of 418 taking 200 IU of vitamin E There is no control group. This study is not an experiment not blind. double-blind blind, but not double-blind none of the above
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In this study, the control group is the first group of 310 subjects who were instructed to take 600 mg of vitamin C alone. They serve as a baseline to compare the effects of vitamin C combined with varying doses of vitamin E in the other groups. This foundational approach helps researchers understand if adding vitamin E truly enhances flu prevention. Furthermore, this study is not blind, as all subjects knew which treatment they were receiving. This knowledge can influence their expectations and perceptions regarding the treatment's effectiveness, potentially skewing the results. Ideally, in blind studies, subjects remain unaware of their treatment assignments to reduce bias.
