单选：已知某常规药治疗冠心病的有效率为70%。根据纳入标准和排除标准选取300例冠心病患者，采用某新药进行治疗，结果显示240例患者有效。欲比较新

题目内容：
已知某常规药治疗冠心病的有效率为70%。根据纳入标准和排除标准选取300例冠心病患者，采用某新药进行治疗，结果显示240例患者有效。欲比较新药的疗效是否好于常规药，宜采用（）。
A．样本率与总体率比较的Z检验
B．两样本率比较的Z检验
C．两样本均数的t检验
D．配对设计四格表资料的Z检验
E．成组设计四格表资料的χ2检验
参考答案：
答案解析：

__________ he tried to cover the truth, it came out at last．A.No matter what B.

__________ he tried to cover the truth, it came out at last．A.No matter what B.

分类：疾病控制(医学高级)  题型：单选
查看答案

Which of the following shows the proper pronunciation of the word "should" ...

Which of the following shows the proper pronunciation of the word "should" ...

分类：疾病控制(医学高级)  题型：单选
查看答案

When a student said "Yesterday I goed to see a friend of mine", which of th...A.

When a student said "Yesterday I goed to see a friend of mine", which of th...A.

分类：疾病控制(医学高级)  题型：单选
查看答案

Unlike some other food-capable 3D printers, the Foodini device__________ from...

Unlike some other food-capable 3D printers, the Foodini device__________ from...

分类：疾病控制(医学高级)  题型：单选
查看答案

Passage 2"There is one and only one social responsibility of business," w...A.

Passage 2"There is one and only one social responsibility of business," w...A.

分类：疾病控制(医学高级)  题型：单选
查看答案