Final answer:
In the 'better than average illusion' experiment, the most accurate group was the minority of two or more people who dissented from the incorrect consensus.
Step-by-step explanation:
In the 'better than average illusion' experiment conducted by psychologist Solomon Asch, the most accurate group was the minority of two or more people who dissented from the incorrect consensus. Asch found that when even one person in the group gave a correct answer, the subject conformed to the group's incorrect answer only a quarter as often. This demonstrated that having a single ally increased the likelihood of giving the correct answer in the face of near-unanimous consent from the group.