问题 单项选择题 案例分析题

(一)某地区家计调查资料得知,每户平均月收入(

)为8000元,标准差为800元,每户平均月消费支出(

)5200元,方差为40000元,收入与支出的协方差(=r×σx×σy)为157000元,支出对于收入的回归系数为0.2。请根据上述资料回答下列问题:

收入与消费支出的相关系数为()。

A.0.96

B.0.95

C.0.97

D.0.98

答案

参考答案:D

阅读理解

阅读理解。

     There is a one-day holiday in most western countries on New Year's Day. The real celebration begins

on New Year's Eve-the night before New Year's Day. There are several interesting customs (习惯) in the

west, and there are many differences in different countries.

     Though Christmas is a good time for families to get together, New Year's Day is a time for some

western people to be with friends. On New Year's Day, there are always parties. At such parties, there is

food, drinks and dances until New Year comes

     At midnight, people often say "Happy New Year! "to each other. In many western countries, fireworks

are let off at midnight and some people like to shout aloud to drive away evil spirits.

1. People begin to have great celebrations for the New Year on _____.

A. New Year's Day

B. the night before New Year's Eve

C. the night of New Year's Day

D. New Year's Eve

2. In the west, _____ on New Year's Day.

A. friends always get together

B. friends write to each other

C. people can have a week's holiday

D. people go from one country to another

3. On New Year's Eve, western people don't often _____.

A. say "Happy New Year" to each other

B. let off fireworks

C. sing a Scottish song

D. shout aloud to drive away evil spirits

4. This passage mainly (主要) tells us _____.

A. western people drink together on New Year's Day

B. how western people celebrate their New Year's Day

C. what western people eat on New Year's Day

D. western people have a good time on New Year's Day

单项选择题