題組內容
4. (10%) Let X₁, X₂, ... , Xₙ, Xₙ₊₁ be a sample from normal population having an unknown mean μ and variance 1. Let 
be the average of the first n of them.
(a) What is the distribution of 
? (5%)
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4. (10%) Let X₁, X₂, ... , Xₙ, Xₙ₊₁ be a sample from normal population having an unknown mean μ and variance 1. Let be the average of the first n of them.
(a) What is the distribution of ? (5%)