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Which of the following statements are true of operational definitions?
By strictly defining the research variables and how they are measured, replication of research is made possible.
They remove the psychological focus on mental processes such as 'happiness' because they are variables that can't be measured.
They guarantee validity of experiments by making sure the Independent variable is the only factor influencing the Dependent Variable.
They make experiments more ethical because participants are better informed before providing consent.
They make experimentation the preferred research method over descriptive and correlational studies in Psychology.