Without some correction, such as the Spearman-Brown formula, a correlation measuring split-half reliability will tend to overestimate the reliability for the full test.

Question

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The Spearman-Brown formula is used to correct for the underestimation of reliability when using split-half methods, by predicting the reliability of the full test based on the split-half reliability.

Without Some Correction, Such as the Spearman-Brown Formula, a Correlation