Sample variance is defined as: ^σ2=∑ni=1(Yi−¯Y)2n−1and (n−1)^σ2σ2∼χ2n−1It follows that we want Prob{^σ2⩽σ2n−1χ2n−1,α/2}=Prob{^σ2⩾σ2n−1χ2n−1 ...
確定! 回上一頁