單項選擇題如果y和x的樣本相關(guān)系數(shù)為0.81,則y對x的線性回歸模型的判定系數(shù)為()
A.0.19
B.0.81
C.0.6561
D.0.9
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1.單項選擇題居民家庭人均消費(fèi)支出的差異隨著家庭人均收入的提高而增加,這種現(xiàn)象稱為()
A.直線趨勢
B.曲線趨勢
C.異方差
D.異常數(shù)據(jù)
2.單項選擇題
使用最小二乘法估計得出的樣本回歸直線必然通過點(diǎn)()
A.(0,0)
B.(x,0)
C.(0,y)
D.(x,y)
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