Comparison Of Two Sample Means Tests

In this Paper Three testes which are used for testing the equality of means of two normal populations when the population variances ratio is known are compared through an extensive simulation study . the testes aer the sometimes (ST) test ,the alwayes welch (AW) test ,the always Hsu (AH) test .the estemated probabilities of Types 1 and 2 are calculated for selected sample sizes n,m=6,16,31,specified mean -testsignificance level &=0.05 and perlimintary variance-testsegnificance level a=0.01. the resalt shows that AH test has goood properties of error probabilitcs .the paper takce into account the simlicity of the tests in applying as an additional factors in the comparison and gives apprppiate and relevant conclusions.

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