Child Psych

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Test construction requires that tests have both validity and reliability. What is the Spearman-Brown prophecy formula used for in this context?

To predict increase in reliability if a test were longer than it is
To predict reliability of a speeded test
To predict criterion-related validity of a test score
To predict if standard error of measurement is useful

Explanation

Answer: A - The Spearman-Brown prophecy formula is used to predict increase in reliability of a test if it were longer than it is. Specifically, the formula is used in the context of split-half reliability to account for the reduction in reliability resulting from this method of testing score consistency.

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