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问题 单项选择题

异质性检验的统计量服从何种分布（k为研究的个数ni为第i个研究的样本量）（）

A.自由度为∑ni-k的卡方分布

B.自由度为k-1的卡方分布

C.自由度为k-1的F分布

D.自由度为∑ni-k的F分布

E.自由度为k-1的t分布

答案

参考答案：B

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短文填空

Dear Sally,    

        I really need your help. I'm feeling u   1   these days, because I get so many p  2  .I'mnot a

good-looking girl and I'm not good at studying, e  3  . Some of my classmatesalways make jokes

of the way I d   4  . They think my clothes are all out of s   5   ,e  6   my best friend, Lily. I tried

everything I can,  but nothing s  7   to work. What's more, infamily, there' s a more s  8   problem.

My parents a  9   with each other and they don't talk to each other now. Can you give me some a

  10  ?                                    

                                                                                                              A sad girl,                                  

                                                                                                              Susan

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单项选择题

投资回收期的判别标准是______。

A．0
B．财务基准收益率
C．同行业收益率参考值
D．基准投资回收期
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