设总体X～N(μ,σ^2),μ和σ是未知参数。为估计参数σ^2的置信区间，应选T=____________作为枢轴变量,并且T服从______。? 
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举一反三
- <img src="http://img1.ph.126.net/JMg9tqo6gf8sEot0y9NSUg==/6619559177490984445.gif" />? 0|<img src="http://img1.ph.126.net/uSXYTJKY1--cmM46BmL7Pg==/1177972777551495010.gif" />|<img src="http://img0.ph.126.net/-vDBDVZEQJqbFun7PrX7vg==/2887370311115280318.gif" />|<img src="http://img2.ph.126.net/NK1mnxUZa_ibCGqQvHOaoQ==/2435884448470832003.gif" />
- <img src="http://img1.ph.126.net/xRWXQUfZJwmSXkQiZ0l2HQ==/3826089358528721080.jpg" />? <img src="http://img2.ph.126.net/QX-jBzzFTrwpTjQkcBtfcg==/2449958197307439176.jpg" />|<img src="http://img0.ph.126.net/3XApesgU0Iga8L5Tkm0YXg==/6630324495838409649.jpg" />|<img src="http://img2.ph.126.net/sPsiWYSStdIbrCUcsMBK9A==/3114802092298176869.jpg" />|<img src="http://img1.ph.126.net/y-FdOVmaocQvOIOXtXTxEw==/662592095194801258.jpg" />
- <img src="http://img0.ph.126.net/q6tqn77YyTg_j7CabeHYJw==/3109735542717391842.jpg" />? <img src="http://img1.ph.126.net/QO3FWMGgxAVtN31l0ulKFw==/6619487709235793443.jpg" />|<img src="http://img2.ph.126.net/-x9WCwFJKaqmfOJLJjH0_Q==/6630623563001319953.jpg" />|<img src="http://img1.ph.126.net/5eiGUQZYA2gEX9q4m57n4Q==/6608642126539334311.jpg" />|<img src="http://img1.ph.126.net/YixVkAU6iexb7xitW-q8Lg==/6630125484233816848.jpg" />
- <img src="http://img2.ph.126.net/qowvyGJmU71A6UIpMtWkYw==/6619531689700953755.jpg" />? <img src="http://img2.ph.126.net/un3GDHXLxtcRiMEcP1z7yg==/6619072093840546265.jpg" />|<img src="http://img2.ph.126.net/IZ9fF3KQHcgJNZoygylhHQ==/6630845664350440712.jpg" />|<img src="http://img2.ph.126.net/_iw_TRTbgBcFfQ9EIzN3YA==/6619139164049839979.jpg" />|<img src="http://img2.ph.126.net/Tehi0XAX-FVa8la7PAFlnw==/2435602973495420798.jpg" />
- <img src="http://img0.ph.126.net/-HjzgzaxCfJQbAEh01L6vQ==/663999470078348889.png" />? <img src="http://img0.ph.126.net/rX_-HH044xPMBSdLBsxXVg==/2788572594290376300.png" />|<img src="http://img0.ph.126.net/lB8kt0PVQIYV0rJM_97wZw==/6630199151512813455.png" />|<img src="http://img0.ph.126.net/L9YBeCXXOsJAiiP4EvaQpQ==/6630603771791932530.png" />|<img src="http://img0.ph.126.net/AkZr_KXKSujR-czNy0CcJQ==/6619409643910206792.png" />