【单选题】Lily spends two hours __ every day.
【单选题】关于线性回归的下列说法哪一个是错误的?
A.
当样本观测值残差的方差不相等时会出现异方差性
B.
非条件异方差性会导致估计的不充分,而条件异方差性会干预估计的结果
D.
当多元回归中的两个或多个自变量之间存在高度相关性时会出现多重共线性
【单选题】It my mother half an hour to the shopping mall.
【单选题】He spends(花费) _________ on his homework every morning. A. t wo and a half hour B. two hour and thirty minutes C. two hours and a half
B.
two hour and thirty minutes
【单选题】Lily spends two hours _________ every day.