题目内容

Albert Einstein was born in 1879. As a child, few people guessed that he ________ a famous scientist whose theories would change the world.

A. has been
B. had been
C. was going to be
D. was

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He must have sensed that I ________ him. He suddenly glanced at me and said quietly, "Why are you staring at me like that?"

A. would look at
B. looked at
C. was looking at
D. am looking at

两样本平均数进行比较时，分别取以下检验水平，以（）所对应的犯第二类错误的概率最小。

A. 0.20
B. 0.10
C. 0.05
D. 0.01

当样本容量n<30且总体方差σ2未知时，平均数的检验方法是。

A. t检验
B. u检验
C. F检验
D. χ2检验

两样本方差的同质性检验用。

A. u检验
B. F检验
C. t检验
D. χ2检验