Abstract
Ss attempted to discover a principle by which numbers and letters were paired. Seven groups of Ss varied on two dimensions, proportion of positive instances sampled and degree of restriction in selecting instances for test. Ss who sampled a higher proportion of positive instances were superior to those sampling a lower proportion. Ss who were unrestricted in their selection of instances, because they sampled a higher proportion of positive instances, performed better than Ss who were restricted and sampled a lower proportion. Finally, when both restricted and unrestricted groups were equated for proportion of positive instances sampled, performance was similar.
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