The validity of a confidence scored vocabulary test was investigated by demonstrating an increase in its reliability without changing the relative difficulty of the test items and without detecting any personality bias in the confidence scoring system. The reliability estimate of the vocabulary test increased from .57 using a traditional scoring system to .85 using a confidence scoring system. No significant interaction was found between the difficulty of the test items and the type of scoring system. Three personality measures failed to correlate significantly with the confidence scores of the vocabulary test.
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