Letter series and number series tests, consisting of items based on id
entical rules, were administered in a counterbalanced design to 320 (1
60 female and 160 male) undergraduates in order to investigate the gen
der differences in inductive reasoning ability measured by letter and
number series tests. Results indicated that female college students ob
tained significantly higher (p < .05) means on letter series tests, bu
t showed no such superiority on number series.