Why t- distribution have n-1 degrees of freedom? I know that it is used when population variance is not known but what determines n-1
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As a rule of thumb you lose a degree of freedom for every parameter of the distribution you use estimated from the sample. – Conrad Turner Apr 06 '15 at 09:23
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I mean how shape vary as per degrees of freedom. what shape has to do with it. – Milan Amrut Joshi Apr 06 '15 at 09:25
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Looking for down to earth answer. I am not statistician. – Milan Amrut Joshi Apr 06 '15 at 09:26