題組內容
4. (12%) Let X₁, X₂, ..., Xₙ be a random sample from N(μ, σ²), where both parameters are unknown.
(a) \( (4\%) \) Find a pivotal quantity of \( \mu \)
4. (12%) Let X₁, X₂, ..., Xₙ be a random sample from N(μ, σ²), where both parameters are unknown.
(a) \( (4\%) \) Find a pivotal quantity of \( \mu \)