15. In a study comparing individual performance with group performance, Laughlin, Zander, Kasevel, mit Tan (2003) forand that groups consistently outperformed the best of the individuals. The task was letters-to-mimbers problem in which an arithmetic problem was presented substituting a letter in place of each digit Participants had to determine which letters coeresponded to each member, Three-person groups competed with individuals and scores were compared for the groups and the best of the individuals The dependent variable was the number of friais needed to solve cach problem. The following data are similar to those obtained in the study.

Groups Individuals 4- 15 115 M -3%

M-4.7

$9- 15.4 SF- 18.2