An experimental design in which participants in different groups are the same on certain important variables (e.g. IQ, gender, age) is known as a:

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A matched design is an experimental design where participants in different groups are matched on key characteristics, such as IQ, gender, age, etc., to ensure that these variables do not confound the results of the experiment. This approach helps in making the groups as similar as possible except for the treatment variable.

An Experimental Design in Which Participants in Different Groups Are