The effect of the normatively based plaintiff bias (favoritism toward an individual suing a corporation) on decision making was assessed for six-person mock juries that made decisions, or merely discussed the case, or for individual jurors. Decision makers also received information in either tables or graphs but there was no effect of this manipulation. It was predicted that groups would award more money than individual decision makers, and that the effect of the plaintiff bias on individual opinions would be strongest when groups discussed but did not decide. Group decisions were higher than individual decisions, and examination of the amount and perception of consensus achieved in groups indicated that the bias affected opinions when groups discussed, but not when groups decided. These results demonstrate the effects of the norm on intermember social influence and opinion change absent similar effects arising from the process of group decision making. The results are integrated with existing research on related issues.
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