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9-5 Comparing Variation in Two Samples (Explained in spanish)
Because the characteristic of variation among data is extremely important, this section presents the F test for using two samples to compare two population variances (or standard deviations). In this section we introduce the F distribution that is used for the F test. It is extremely important to be aware of a serious shortcoming of this procedure: The F test for comparing two population variances (or standard deviations) is very sensitive to departures from normal distributions. At the end of this section we briefly discuss alternatives to the F test that are not so sensitive to departures from normality.
Debido a que la caracterÃstica de variación entre los datos es extremadamente importante, esta sección presenta la prueba F para usar dos muestras para comparar dos varianzas de población (o desviaciones estándar). En esta sección presentamos la distribución F que se usa para la prueba F. Es extremadamente importante estar consciente de una deficiencia grave de este procedimiento: la prueba F para comparar dos variaciones de población (o desviaciones estándar) es muy sensible a las desviaciones de las distribuciones normales. Al final de esta sección discutimos brevemente las alternativas a la prueba F que no son tan sensibles a las desviaciones de la normalidad.
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