,(x)_(n),(x)_(n+1) 是来自N(μ,σ^2)的样本, overrightarrow ({x)_(n)}=dfrac (1)(n)sum _(i=1)^n(x)_(i)(s)_(n)=dfrac (1)(n-1)sum _(i=1)^n(({x)_(i)-overline ({x)_(n)})}^2 试求常-|||-数c使得 _(c)=cdfrac ({x)_(n+1)-overline ({x)_(n)}}({S)_(n)} 服从t分布,并指出分布的自由度.

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