請問96年統計學大意第22、38題,謝謝 - 考試
By Kyle
at 2014-01-07T13:42
at 2014-01-07T13:42
Table of Contents
不好意思,因為我不是很強,觀念以點弱,所以有一些很簡單的問題不懂,
雖然我很怕讓人笑掉大牙,可是考試近在眼前,我決定豁出去了,
請各位前輩們不吝指導,謝謝。
1.96年第22題
簡單線性迴歸分析的統計報表中,若「判定係數」(coefficient of determination)
R^2 接近1,第3個選項 迴歸線的斜率接近+1 或-1
考選部答案: 正確
我的想法:
判定係數接近1,不是只能確定有直線關係,
斜率不一定會是 +1或-1吧,好像有點怪怪的。
2.96年第38題
在檢定時,.......(因為很多數學符號無法標示),若增加樣本數,選項1:「型Ⅰ錯誤」
機率會下降 選項2:「型Ⅱ錯誤」機率會下降
考選部答案為 選項2正確
我的想法:
樣本數增加,應該「型Ⅰ錯誤」、「型Ⅱ錯誤」機率會同時下降,我有查到書上解釋為:
在檢定時「型Ⅰ錯誤」機率(即顯著水準)為一定值,因此在一顯著水準下,增加樣本數只
會使得「型Ⅱ錯誤」機率會下降。我個人是覺得這樣的解釋有點....不是很滿意
麻煩各位前輩了
--
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