問答題

設有一組來自正態(tài)總體的樣本觀測值:

0.497,0.506,0.518,0.524,0.488,0.510,0.510,0.515,0.512,
⑴已知,求的置信區(qū)間(設置信度為0.95)

未知,求的置信區(qū)間(設置信度為0.95)


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