The paper examined the process leading to the confirmation of a perceiver’s expectancies about another when the social label that created the expectancy provides poor or tentative evidence about another’s true dispositions or capabilities. Participants were 67 undergraduates. One group was led to believe that a child came from a high SES background; the other group, that the child came from a low SES background. Nothing in the SES data conveyed information directly relevant to the child’s ability level, and when asked, both groups reluctantly rated the child’s ability level to be approximately at grade level. Two other groups received the SES information and then witnessed a videotape of the child taking an academic test. Although the videotaped series was identical for all participants, those who had information that the child came from a high SES rated her abilities well above grade level, whereas those for whom the child was identified as coming from a lower-class background rated her abilities as below grade level. Both groups cited evidence from the ability test to support their conclusions. Findings are interpreted as suggesting that some “stereotype” information creates not certainties but hypotheses about the stereotyped individual. However, these hypotheses are often tested in a biased fashion that leads to their false confirmation.
