# To compare two population means, displaystylemu_{{1}} and displaystylemu_{{2}} we use the information from the samples.

To compare two population means, ${\mu }_{1}$ and ${\mu }_{2}$ we use the information from the samples.
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Nola Robson
In this case of dependent two mean T test we have one common factor in both population. for example in case of weight loss procedure , we have to collect data for an individual before and after weight loss this is called as dependent sample.