问题 解答题

判断下面几个抽样调查选择样本的方法是否合适,请说明理由.

(1)估计我国儿童的身高状况,在某幼儿园的一个班级里进行调查;

(2)为了解观众对所观看影片的评价情况,随机调查某电影院单排单号的观众;

(3)某市为了解读者到市图书馆借阅图书的情况,从全年的借阅人数中调查了20天中每天到图书馆借阅图书的人数;

(4)为调查一个学校的学生上学坐班车的情况,抽取初一年级的两个班进行调查.

答案

答:(1)不合适,我国有的儿童没有条件上幼儿园,因此只在幼儿园里抽样调查不具有代表性;

(2)合适,这是一种随机抽样的方法,具有代表性;

(3)合适,这是一种随机抽样的方法,具有代表性;

(4)不合适,一个学校初中生有三个年级,只是初一年级学生不具有代表性.

选择题

New Schedules of Cathy Pacific Airways
                           Shanghai ----------- Hong Kong
CX301
Tue. , Thur. , Sat. , Sun. 
Dep    Shanghai      20:30
Arr    Hong Kong    21:45  
 
                            Hong Kong -----------  Shanghai
CX300
Tue. , Thur. , Sat. , Sun,
Dep     Hong Kong  15:15
Arr     Shanghai    19:15  
 
                              Beijing   -----------   Hong Kong
CX311
Tue. , Thur. , Fri. 
Dep     Beijing          17:45
Arr     Hong Kong       19:45  
 
                             Hong Kong  -----------    Beijing
CX310
Tue. , Thur. , Fri. 
Dep      Hong Kong   12:50
Arr      Beijing       16:40  
小题1:The above is a  __________.
A.pictureB.piece of newsC.formD.timetable
小题2:It supplies information to people who are going between Shanghai and Hong Kong or Beijing and Hong Kong ____________.
A.by bikeB.by carC.by shipD.by plane
小题3:There are _________ flights from Shanghai to Hong Kong every week.
A.3B.5C.4D.6
小题4:How long does it take you if you want to go to Hong Kong from Beijing by air ?
A.2 hoursB.4 hoursC.3 hoursD.five hours and a half
小题5:Suppose on arriving in Shanghai by Cathy Pacific flight on Thursday, you are told to return to Hong Kong by Cathy Pacific Airways at once. Now the most probable way is _________.
A.to wait until Saturday
B.to stay in Shanghai and take the Friday’s flight from Shanghai to Hong Kong
C.to go to Beijing and take the Friday’s flight
D.to take the same day’s flight from Shanghai to Hong Kong.
问答题 简答题