Central limit theorem in student’s t-test

My friend is doing a behavioural experiment with a 30% difference in effect size between control and exp group, n= 30 for each group. His data do not form a normal distribution, but still uses the parametric t-test “because central limit theorem”.

I don’t get it. Is he right? Can someone explain to this biology background person? Thank you so much.

submitted by /u/LostThread
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Nevin Manimala

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