Why might researchers need to consider interac3ons in their research?

Q1Why is the inclusion of a comparison group important for an experiment? Relate the concept of a comparison group to the discussion of why research is beFer than experience (Ch. 2) and to the following threats to internal validity: matura3on, history, regression to the mean, and tes3ng. (Ch. 11)
Q2Why might researchers need to consider interac3ons in their research?

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