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In my study there are only 15 subjects in the intervention group and 15 in the control group. Can I use the relevant t-test to analyze each inter group and intra group differences(pre & post). Will it be a problem with this size of small sample. If it is so, can you give me a minimum sample size. Thank you very much

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t-test doesn't have a minimum sample size, in fact it's designed for working with small samples. More details

Is there a minimum sample size required for the t-test to be valid?

Assume that the usual t-test assumptions are satisfied, you can use the test to test for differences.

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SmallChess
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