94年三等生物統計學第一題 - 考試
By Blanche
at 2014-01-20T00:33
at 2014-01-20T00:33
Table of Contents
[考題] 國考歷屆考題與考題觀念討論(書裡看到的選這個)請附上想法、出處
大家好~這一題想破頭還是覺得怪~想請教版上生統高手~謝謝!
出處:94年三等生物統計學第一題的第一小題
一、一個汽車工廠主管懷疑夜班工人噴漆厚度比白天班工人厚,經隨機抽取白天班和夜
班工人所噴漆之汽車各50 部測量噴漆厚度得到下列結果:
白天班:樣本大小n = 50、平均= 9.4 微米、標準差(Standard Deviation)= 0.92
微米。
夜 班:樣本大小n = 50、平均= 9.5 微米、標準差= 0.95 微米。
(一)檢定白天班和夜班的母數變方(σ2)是否有顯著差異。(設α= 0.05)
(tα= 0.05,df = 95,two-tail = 1.99;tα= 0.05,df = 95,one-tail = 1.66;
Fα= 0.05,df = 40、40,upper one-tail = 1.69;Fα= 0.025,df = 40、40,
upper one-tail = 1.88)
想法:
有些符號不會打,所以有參考照片,我是這麼寫的,想請教臨界值的部分,因為覺得題目
給的臨界值條件好怪ㄚ,比如df沒有49,只給40,真的不知道怎麼用?
然後決策是reject H0,這樣是unequal,這樣不就不能往下推下去,這種題型應該要算出
決策是accept H0,才可以繼續算下去才對ㄚ!?謝謝~~~
照片:http://ppt.cc/7zfN
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