问题 解答题

在调查的480名男人中有38名患有色盲,520名女人中有6名患有色盲,分别利用图形和独立性检验的方法来判断色盲与性别是否有关?你所得的结论在什么范围内有效?

答案

解:根据题中所给的数据作出如下的列联表:

根据列联表作出相应的等高条形图,如下图所示,

在男人中患色盲的比例要比在女人中患色盲的比例要大,

其差值为,差值较大,

因而我们可以认为“性别与患色盲是有关的”;

根据列联表中所给的数据可以有a=38,b=442,c=6,d=514,a+b=480,c+d=520,

a+c=44,b+d=956,n=1000,

代入公式

由于K2=27.1>10.828,

所以我们有99.9%的把握认为性别与患色盲有关系,

这个结论只对所调查的480名男人和520名女人有效。

阅读理解

Some people don’t like the number 13. They don’t think 13 is a lucky or good number. For example(比如), they don’t like to live(居住) on the 13th floor(楼).

My friend Mary is one of them. She asks some friends to her home. All of her friends get to her home. They sit at the table. Then Mary counts, “One, two, three ...oh, my God! There are thirteen people here!” Everybody’s face(脸) turns white, but Mr. Brown doesn’t. He says, “Don’t worry(别担心), dear friends! We have fourteen people here. My wife will have a baby next week. She is in the family way now. ”

All of them become happy again. “Congratulations(恭喜)!” they say to Mr. and Mrs. Brown. They enjoy the nice food(享用美食) and have a good time this evening.

小题1:The underlined word “lucky” means “________” in Chinese.

A.幸运的

B.倒霉的

C.难得的

D.常见的小题2:Everybody’s face turns white, because ________.

A.there are thirteen people

B.there are fourteen people

C.they don’t like Mr. Brown

D.they don’t like the baby小题3:Who will have a baby next week?

A.Mary

B.Mr. Brown

C.God

D.Mrs. Brown小题4:When does the story happen(发生)?

A.In the morning.

B.In the afternoon.

C.In the evening.

D.At night.小题5:What is NOT true(正确的)?

A.some people don’t like to live on the 13th floor.

B.Mary and her friends don’t like the number 13.

C.Mr. Brown’s face turns white, too.

D.Mary and her friends became happy at last.

单项选择题