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In a carefully designed study, researchers where study participants were randomly assigned to groups found that the group exposed to the intervention and the group that received a placebo intervention had similar positive response when tested at the conclusion of the study.
What is the best explanation of this result.


1) The researchers were not very experienced and did not know how to conduct a study.
2) The control group might have found the attention they received by being in the study an intervention with a positive effect.
3) The groups must not have had equivalent scores on the pre-test?
4) either/both responses 2 and 3 Here’s the explanation you needed for… View the full answer

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