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Answer:
the group in which the toy did not make noise
Explanation:
In simple words, In a study, the control group serves as the benchmark against which evaluations are conducted. In a study when the impact of a therapy is unknown, assessments among the control group as well as the experimental unit are being utilized to evaluate the impact of the intervention a control group is commonly employed. They also have a striking resemblance to those in that experimental group or those who get the therapy.