题目内容

1 When do people come into your life “for a reason”?

A. When they know you well.
B. When you need them in life.
C. When you can support their career.
D. When they are willing to listen to your troubles.

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2 Who will end the friendship with the person that is in your life for a reason?

A. The person himself.
B. You.
C. Neither you nor the person.
D. Both you and the person.

.一个未知参数的无偏估计一定唯一

A. 对
B. 错

设总体X的数学期望为μ,X1,X2,…,Xn为来自X的样本，则X1是μ的无偏估计。

A. 对
B. 错

.综合无偏估计和有效估计，回答估计量的评选准则，在实际应用中，应选择满足什么条件的估计量？