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Increasing the 16-item Rydell-Rosen Ambiguity Tolerance Scale to 20 items raised the reliability from .64 to .86 (split-half, corrected by Spearman-Brown). The 20-item scale (AT-20) was cross-validated on a sample of 789 undergraduate students. Retest reliability was estimated at .63 ( p < .01) for a 6-mo. interval. As predicted, AT-20 related to (a) performance in a complex task, (b) the F Scale, (c) dogmatism, (d) rigidity, and (e) church attendance. The AT-20 was not affected by social desirability response bias as measured by the Marlowe-Crowne.
A. P. Mac Donald (Mon,) studied this question.
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