Insetospraga associados a cultura da melancia em roraima e. Calculating, interpreting, and reporting cronbachs alpha. Cronbach university of illinois a general formula a of which a special case is the kuder richardson coefficient of equivalence is shown to be the mean of all splithalf coefficients resulting from different splittings of a test. We would like to show you a description here but the site wont allow us. Cronbach s alpha showed the questionnaire to reach acceptable reliability.
Cronbachs alpha is most commonly used when you want to assess the internal consistency of a questionnaire or survey that is. For cronbach, the extension of alpha and classical test theory came when fisherian notions of experimental design and analysis of variance were put together with the idea that some treatment conditions could be considered random samples from a large universe, as alpha assumes about item sampling. It is related to the outcome of an analysis of variance of the item data into variance due to the individuals in the sample and variance due to the items. Most items appeared to be worthy of retention, resulting in a decrease in the alpha if deleted. Within the history of classical test theory, coefficient alpha has had a large role. The purpose of this paper is to show why singleitem questions pertaining to a construct are not reliable and should not be used in drawing conclusions. The one exception to this was item 4, which would increase the alpha to. The reliability evaluation of the instrument by the cronbach alfa resulted in 0. Calculating, interpreting, and reporting cronbach s alpha reliability coefficient for likerttype scales joseph a.
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