In human testing controlled experiments can be tricky and can have ethical consi

Question

In human testing controlled experiments can be tricky and can have ethical considerations. In a controlled experiment investigators apply treatments and then observe the effect of the treatment compared to a control group that does not receive the treatment. When this is not possible investigators may rely on observational studies where investigators simply observe effects without applying any treatment, in observational studies there is no human intervention. Consider the following example In one study subjects were randomly given either a placebo 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. The first study was a controlled experiment, while the second group was an observational study The first study was and observational study while the second group was an experiment. Both studies were observational studies Both studies were controlled experiments

Explanation / Answer

I believe the correct answer to be:

A) The first study was a conrolled experiment, while the second group was an observational study.

Because in the first study, VitC was given as an experiment and is effects were observer over placebo so its a controlled experiment while in the second study, no drug is provided but a pattern between cold and sleep was observed so this is an observational study.

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