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Hi Dears, I have two groups and I want to compare them corresponding age. I used two-sample t-test. I imported the data of each group with out any covariate. I estimated them using classical method. For comparison, I used t-test with the contrast: 1 0 and 1 0 that their results are the same as it is predicted. I have two questions: 1- the steps and contrast are true for age analysis? 2- the T score are very high with compare to T scores in papers. The T score in papers are less than 10 but my T score is more than 50 (maximum is 80). I confused! Thanks for your helping me. Regards Maryam