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【多选题】
在一元线性回归分析中()。A.
回归方程是根据最小二乘法确定的
B.
判定系数r2测度了回归直线的拟合程度
C.
估计标准误差Sy测度了实际观测点在直线周围的散布程度
D.
线性关系的检验是检验自变量与因变量之间的线性关系是否显著
E.
回归系数的检验是检验自变量对因变量的影响是否显著
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举一反三
【单选题】I ____ that we would be able to leave soon, but it’s beginning to look difficult.
A.
hoped
B.
have hoped
C.
was hoping
D.
had hoped
【单选题】I ______ that we would be able to leave tomorrow, but it's beginning to look difficult.
A.
hope
B.
hoped
C.
have hoped
D.
had hoped
【单选题】－I my keys in the room yesterday. I had to get in the window. －It’s erous to do that.
A.
leave, from
B.
left, through
C.
forget, from
D.
forgot, through
【单选题】—Excuse me, visiting hours are over．It' s time for you to leave． —I' m sorry, I didn't know the time or I ______ earlier．
A.
will leave
B.
would leave
C.
had left
D.
would have left
【单选题】I ______ that we would be able to leave tomorrow, but it's beginning to look difficult.
A.
had hoped
B.
has hoped
C.
hope
D.
hoped
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