Distinguish between controlled and uncontrolled observation, and analyze their marits and demarits.
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In a controlled study, researchers are able to determine which of their subjects receive the factor that is being tested for having a causal influence upon another factor. ... In uncontrolled or observational studies, researchers have no such control over whether their subjects receive the treatment being investigated.
Controlled and uncontrolled observation takes place in the natural setting, it may be termed as uncontrolled observation, but when observation takes place according to definite pre-arranged plans, involving experimental procedure, the same is then termed controlled observation
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