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Excerpt from The Influence of Training on Changes in Variability in Achievement
Perrin in 1918 reports an experiment in which twenty-one sub jects practiced solving analogies at the rate of twenty-five at a sitting, once a week for ten weeks. The score was time per analogy. They also practiced mirror-reading typed material at the rate of eighteen pages a sitting, once a week for seven weeks. The score was time per unit, a unit consisting of one-sixth of a page. He plotted the curves for the five best and the five poorest subjects and found that they showed a decided convergence from which he concluded that the superior subjects as contrasted with the inferior, disclosed less capacity for improvement and less tendency toward variability.
Chapman in 1919 reports a practice experiment in typewriting in which he gives the scores of a weekly five-minute test of twenty high school pupils who took a regular course in type writing. The scores began with the twentieth hour and ended with the one hundred eightieth hour. In this paper Chapman was not interested in the effect of practice on individual differ ences but in learning curves. However, we have used his results for this purpose and have given the calculations in the summary table of previous investigations.
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