Abstract
Abstract Three hundred girls in Georgia ranging from 12 through 18 years of age and enrolled in physical education from the seventh grade through the freshman year in college were given eight motor performance test items to measure running, jumping, throwing, speed, and agility. The study was undertaken to test the hypothesis that girls do not improve in motor performance after the age of 13.5 years, and also to investigate whether significant differences existed in motor skills according to age-grade level. Analysis of variance was used to test the significance of variation on each of the eight test items for the seven age-grade groups. Significance of differences in means for each test for each age-grade group was also calculated. Since ninth-grade girls, with a mean age of 14.4 years, scored highest on two items, tenth-grade girls scored highest on four items, and college girls scored highest on two tests, the hypothesis that girls generally do not evidence improvement in motor skills after the age of ...
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