Effects of the number of individuals (1 to 10) coacting while taking two standardized motor performance tests were examined. Scores on the manual and finger dexterity sections of the General Aptitude Test Battery were collected from two state employment agencies for 2,261 actual applicants. Increases in aptitude scores corresponding to increases in group size were predicted based upon the summation hypothesis of social facilitation theory. Results indicated a group size effect with performance appearing to increase somewhat linearly with increases in number of coactors. The implications for social facilitation theory and the interpretation of tests administered in a group setting were discussed.
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