[課業] 生物統計 混合變異數的問題?
兩個獨立樣本T檢定
變異數未知但已知相等要用混合變異數Sp
變異數未知且不相等用樣本變異數去推母體變異數...
如果題目沒講變異數是否相等,那是否要先檢定變異數,判斷要不要用混合變異數,
然後才能檢定平均值??
兩樣本比例的檢定何時要用混和比例去算呢?
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◆ From: 36.228.160.193
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所以像是P1>P2這種就直接用p\hat下去做囉@@?
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我現在手邊的函授是教要先檢定變異數,但是也說題目"通常"一定是變異數相等
講師似乎是認為國考生統不會考太難,所以不會出變異數不相等的題目,自由度公式也沒教
然後我看好多考古題連F表都不給,擺明不給作變異數是否相等的檢定...
然後又參考三元的那本題庫,也都沒先檢定變異數,都直接做Sp...
※ 編輯: saber102 來自: 36.228.160.193 (06/02 16:12)
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