Abstract
Hearing children at 5 ages, CA 7-15, and deaf children at 3 ages, CA 11-15, were compared on a 2-choice probability concept task. Ss made predictions at varying uneven odds, even odds, and for sure thing outcomes. Both deaf and hearing improved with increasing age. Younger deaf were slightly poorer, but older deaf, though still language deficient, caught up with the hearing. Although sure thing results indicated that the objective odds were generally known to Ss, incorrect predictions were numerous at older ages. Ss at all ages were sensitive to differences among uneven odds. However, with increasing age, Ss were more sensitive to the smaller departures from even odds. Occurrence of initial alternation of predictions decreased with increasing age but remained sizable at older ages. It was concluded that Ss show a developmental sequence in dealing with probability situations.
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