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In the formulae of Sp, S_1^2 and S_2^2 it refers to standard deviation of each population, why you equalize to the standard error?.

Thanks for your time Johnny!!!
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I assume they were sample standard deviations instead of s. e. s. Otherwise, the variances seemed to be a little bit too different. But you can simply change Tue formulas to reflect they are s. e. s.
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