Question: Need help developing a research question, but first need to understand this: a) When creating an experimental design, what is the goal of having a

Need help developing a research question, but first need to understand this:

a) When creating an experimental design, what is the goal of having a control group?

b) What is the point of having a placebo?

c) What is an example of a study where a placebo or control is not needed?

Please cite scientific evidence/examples

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