Question

Is this investigation a controlled experiment or an observational study? Explain your answer.

Answer 1

In an observational study, we measure or survey members of a sample without trying to affect them. ... In a controlled experiment, we assign people or things to groups and apply some treatment to one of the groups, while the other group does not receive the treatment.

Answer 2

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☞The researcher has no control over the variables in an observational study. An experiment is a method of applying treatments to a group and recording the effects. Remember, a good group experiment will have two basic elements: a control and a treatment......ツ