Sample Size Requirements for Testing and Estimating Coefficient Alpha

Douglas G. Bonett

Journal of Educational and Behavioral Statistics, 2002, vol. 27, issue 4, 335-340

Abstract: An approximate test and confidence interval for coefficient alpha are derived. The approximate test and confidence interval are then used to derive closed-form sample size formulas. The sample size formulas can be used to determine the sample size needed to test coefficient alpha with desired power or to estimate coefficient alpha with desired precision. The sample size formulas closely approximate the sample size requirements for an exact confidence interval or an exact test.

Keywords: hypothesis testing; internal consistency; interval estimation; sample size determination; test reliability (search for similar items in EconPapers)
Date: 2002
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Persistent link: https://EconPapers.repec.org/RePEc:sae:jedbes:v:27:y:2002:i:4:p:335-340

DOI: 10.3102/10769986027004335

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