[問題] 請教一題數乙機率的問題
有10筆資料(Xi,Yi),X算術平均數為5,Y算術平均數為3,相關係數r=2/3
且Y對X回歸線過(0,2) 下列何者為真
A.迴歸線斜率<0
B.迴歸線方程式 Y=(-1/5)X+2
C.迴歸線過點(10,0)
D.X組標準差>Y組標準差
E.X組變異係數>Y組變異係數 (<---變異係數 印象中不在數乙考試範圍 0.0)
我是想出迴歸線的公式 斜率=r*Sy/Sx 判斷A選項應該錯 如此B選項應該也錯
那麼B選項正確是...??
剩下的我就沒有什麼頭緒了
感恩幫忙
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