It was hypothesized that a third-party's evaluation of a dating couple's chances for marital success is a function of the degree to which the dating partners are attitudinally similar to each other. Students evaluated dating partners who were either 25%, 58%, or 92% similar to each other on a 12-item attitude survey and indicated on a nine-step scale their estimates of the probability that a marriage between the two persons would be successful. The obtained results strongly supported the hypothesis (p < .001).
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