Re: [閒聊] 請問大家今年對經建行政感覺如何?
※ 引述《vin78128 (華宰)》之銘言:
: 如題,台南華仔很想知道大家考得感覺如何?有人覺得國經是關鍵科目嗎?謝謝!
不好意思,借標題一問~
統計學第五大題最後一小題,檢定兩個常態母體的mean是否相同
http://www.public.tw/prog/gavin/reference/rfile/FD-20160713145401-EMO.pdf
從補習班解答的作法(還有題目的問法)來看
是先檢定變異數是否相同,不拒絕的話就把兩母體的變異數當作相同,
接著檢定mean的時候就可以用pool-t test
但是這樣做的邏輯是否正確?
因為事實上兩母體的變異數確實可以不相同,只是檢定"沒有拒絕"變異數相同的假設
在兩母體變異數不相同的前提下,檢定mean的統計量也就不是pool-t的分配了
那用pool-t test去檢定mean不就完全沒有意義了嗎?
有沒有統計高手可以解答一下~~
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不是的,x_a-x_b ~ N(μa-μb, (σa)^2/5 + σb^2/5)
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我直接把x_a-x_b標準化,未知的σa σb替換成 S_a S_b ,
樣本size夠大可以近似成N(0,1)
※ 編輯: youfly (1.171.49.244), 07/13/2016 23:22:26
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