【单选题】某研究拟采用病例对照研究的原理,探索50岁以上者吸烟与结直肠癌的关系,下面描述不正确的是:
A.
病例组可以只选择男性,对照组要选择同年龄段的不吸烟者男性
B.
对照组不能选择40岁以下者,因为年龄上没有可比性
【多选题】下列关于定性调查和定量调查的描述,正确的有( )。
B.
定量调查一般使用讨论提纲或讨论指南而不是用调查问卷
【简答题】With the rapid development of science and technology, the mobile phone has got more and more functions. It can be not only to communicate and access to the web, but also to play mp3,watch television, ...
【多选题】下列关于定性调研的描述正确的有( )。
D.
由调查人员主观地找一些人来接受调查就可以了,而且人数不需要很多
【多选题】以下 对探索性调研描述正确的 有 ( )
D.
调研在增长见识和建立假设方面具有灵活性的特点
【简答题】With the rapid development of the Internet, more and more people have access to it for information, entertainment and even education. As a new means of education, online education has caused much publ...
【简答题】With the fast development of China, more and more citizens have bought cars. That means the number of cars running on the roads of China is increasing. This also brings a serious problem:air pollution...
【简答题】With the development of the society, more and more ordinary people are engaged in charity activities. Accordingly, a new form. of charity comes into being, that is, micro-charity, in which ordinary pe...
【判断题】It is regarded that money supply is good to the economic development , the more the better.