【判断题】若直线回归方程Y=170-2.5x,则变量x和Y之间存在着负的相关关系。( )
【单选题】听力原文:W: Did Jim paint the house himself? M: He had it painted because he was too busy. Q: What do you know from the conversation? (15)
A.
Jim asked somebody else to paint the house.
B.
Jim's house was not painted because he was busy.
C.
Jim painted the house himself.
D.
Somebody will paint the house for Jim.
【判断题】上三角的正交矩阵A必是对角矩阵,若 ,则A的对角线上的元素都是1 。
【单选题】—What does Lily look like? —______________________________.
A.
Her hair is blond and curly
【单选题】Jim painted a picture( ) the wall of the house.
【判断题】若直线回归方程y=170-2.5x,则变量x和y之间存在着负的相关关系。( )
【判断题】若直线回归方程Yc=170—2.5K,则变量x和y之间存在着负的相关关系。