[题目]在一项中学生近视情况的调查中.某校男生150名中有80名近视.女生140名中有70名近视.在检验这些中学生眼睛近视是否与性别有关时用什么方法最有说服力( )A．平均数与方差 B．回归分析C．独立性检验 D．概率题目和参考答案——青夏教育精英家教网—

题目内容

【题目】在一项中学生近视情况的调查中，某校男生150名中有80名近视，女生140名中有70名近视，在检验这些中学生眼睛近视是否与性别有关时用什么方法最有说服力（）

A．平均数与方差 B．回归分析

C．独立性检验 D．概率

【答案】C

【解析】判断两个分类变量是否有关的最有效方法是进行独立性检验，故选C.

练习册系列答案

相关题目

【题目】

--- Have you known Dr Jackson for a long time?

--- Yes, since she the Chinese Society.

A. has joined

B. joins

C. had joined

D. joined

【题目】

Kids don’t have to pay bills，cook dinners，or manage car polls (合伙使用汽车)．But—just like adults—they have their share of daily demands and things that don’t go smoothly.If frustrations and disappointments pile up，kids can get worried.

It’s natural for all kids to worry at times，and because of personality differences，some may worry more than others.Luckily，parents can help kids manage worry and deal with everyday problems with ease.Kids who can do that develop a sense of confidence and optimism that will help them master life’s challenges，big and small.

What kids worry about is often related to the age and stage they’re at.Kids and preteens typically worry about things like grades，tests，their changing bodies，fitting in with friends，a goal they missed at the soccer game，or whether they’ll make the team.They may worry about social troubles like cliques (派系，小圈子)，peer (同龄人) pressure，or whether they’ll be bullied (欺负)，laughed at，or left out.Because they’re beginning to feel more a part of the larger world around them，preteens also may worry about world events or issues they hear about on the news or at school.Things like terrorism，war，pollution，global warming，endangered animals，and natural disasters can all become a source of worry.

【1】From the passage，we learn that________.

A．not kids but adults may get worried about something

B．the worries that kids experience vary from one to another

C．kids worry about the same issues，regardless of their age

D．preteens may not worry about fire or earthquakes

【2】What is the third paragraph mainly about?

A．Advice on removing kids’ worries.

B．The negative results of getting worried.

C．Why kids get worried.

D．What kids may worry about.

【3】The next paragraph might talk about________.

A．suggestions for kids to deal with worries

B．the importance of avoiding getting worried

C．different opinions on kids getting worried

D．subjects that teenagers and adults worry about

【4】The passage is most likely intended for________.

A．scientists

B．teachers

C．parents

D．doctors

【题目】结合个人的感悟对汉字进行新的理解，可以赋予汉字特殊的意义。请仿照示例，自选两个汉字进行别解，要求紧扣字形，有积极意义，表述简练。

示例：惩——对心的征服，才是处罚的最终目的。

悟——做思考的我，才能形成我的思想。

答：

【题目】下列加横线词语的古今义相同的一项是( )

A．昼夜勤作息嬉戏莫相忘

B．共事二三年可怜体无比

C．处分适兄意不久当还归

D．叶叶相交通千万不复全

【题目】三维柱形图中柱的高度表示的是（）

A．各分类变量的频数 B．分类变量的百分比

C．分类变量的样本数 D．分类变量的具体值

【题目】如果直线a平面α，直线b平面α，M∈a，N∈b，且M∈l，N∈l，那么（）

A.lα B.lα

C.l∩α＝M D.l∩α＝N

【题目】已知结论“函数y＝2x＋5的图象是一条直线”，若将其恢复成完整的三段论后，大前提是________．

【题目】在下列句子横线处填上的词语,最恰当的一组是（）

（1）海南岛拥有中国唯一的冬季温暖海滩，三亚更是这个旅游金矿中 _____最高的一块。随着度假旅游的普及，三亚的旅游收入也迎来了飞速增长。

（2）马丁·路德·金在《我有一个梦想》中说，白人的自由和黑人的自由是_____的，所以也要信任一部分白人。

（3）但单靠报纸和偶然得到的流行文学，是学不会真正意义上的阅读的，而_____阅读杰作。杰作常常不像时髦读物那么适口，那么富于刺激性。

A．品位休戚相关必需

B．品味息息相关必需

C．品位息息相关必须

D．品味休戚相关必须

试题分类