Asch carried out a lab experiment with an independent groups design. In groups of 8 participants judged length of lines by saying out loud which comparison line matched. Each group contained only one real participant, the others were confederates. The real participant always went last or last but one, so that the others gave their answers first. Each participant did 18 trials. In 12 of these the confederates gave the wrong answer. There was also a control group where the participants judged the line length on their own.
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