"Coefficient alpha 20" is a reference to A) a variant of the Kuder-Richardson KR-20 formula. B) the 20^th in a series of formulas developed by Cronbach. C) a 20^th-century revision of a Galtonian expression. D) None of these

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Coefficient alpha is a measure of internal consistency reliability in scale construction. Coefficient alpha 20 refers to a variant of the formula developed by Kuder and Richardson (KR-20) for estimating this reliability, which is appropriate for dichotomously scored items.

"Coefficient Alpha 20" Is a Reference to