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1 In one study subjects were randomly given either 500 or 1000 milligrams of vitamin...

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1 In one study subjects were randomly given either 500 or 1000 milligrams of vitamin C daily and the number of colds they came down with during a winter season was noted In a second study people responded to a questionnaire asking about the average number of hours they sleep per night and the number of colds they came down with during a winter season A The first study was an experiment without a control group while the second was an observational study B The first study was an observational study while the second was a controlled experiment C Both studies were controlled experiments D Both studies were observational studies E None of the above is a correct statement

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