A Modified Graybill and Wang s Confidence Intervals

The confidence intervals for are given in various forms by many authors in one-factor component-of-variance model . In this model, Graybill and Wang s(1980) confidence intervals by using Satterthwaite s(1946) method for are given by an asymptotic confidence intervals. Thus, they are not fit exactly for the given confidence coefficient. Therefore, we would like to give a method of the better confidence intervals and we can find out the better confidence intervals for for the given Graybill and Wang s(1980) confidence intervals by using Satterthwaite s(1946) method in one-factor components-of-variance model.