单项选择题

M: Tom. do you want to go to the shopping center with me today?
M: Sure. but I can’t leave yet. I’ve lost my room key and I have to wait for my wife to let me back into my room.
Q: What is Tom’s problem?（）

A．He won't go shopping without his wife.
B．He lost his key in the shopping center.
C．He can't keep his room clean.
D．He's locked out of his room.

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单项选择题

赤色主证是（）。

A.热证
B.寒证
C.虚证
D.瘀血证
E.实证

【简答题】假定βX₁的真实值为0．4，则估计值是否有偏？为什么？

答案：如果βX₁的真实值为0．4，则表明估计值与真实值有偏误，但一般不说0．339是有偏的。因为0．33...