Abstract
In this paper, we have proposed a combined studentized test statistic for testing the equality of treatment contrasts in case of groups of experiments in presence of heterogeneous error variances. The empirical distribution of the proposed approximate test statistic has been found using Monte Carlo study and the results have been compared with the study of James. From the Monte Carlo simulation study, it has been observed that the distribution of the proposed test statistic was not following chi(2) distribution in all cases considered. Numerical illustration has also been provided.