單項(xiàng)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(xiàng)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(xiàng)選擇題

使用最小二乘法估計(jì)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)

3.單項(xiàng)選擇題在建立y對x的回歸方程時(shí),通常假定()

A.y和x都是隨機(jī)變量
B.y是隨機(jī)變量,x是確定性變量
C.y是確定性變量,x是隨機(jī)變量
D.y和x都是確定性變量

4.單項(xiàng)選擇題在方差分析中,所考察的影響觀測變量的各個(gè)因子都必須()

A.屬性化
B.數(shù)量化
C.同質(zhì)化
D.差異化

5.單項(xiàng)選擇題在單因子方差分析中,如果各個(gè)因子水平效應(yīng)相同的原假設(shè)為真,則組間平方和SSA()

A.等于0
B.等于總平方和
C.完全由觀測的隨機(jī)誤差引起
D.完全由各因子水平的差異引起

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