问题
单项选择题 A2型题
某广告说用某药治疗了100例某病病人，其中95例痊愈，治愈率达95%。此治愈率不可信的主要原因是（）
A.所治病例数过少
B.缺少对照组
C.治愈率太高
D.没有经过统计学检验
E.没有关于偏倚控制的说明
答案
参考答案：B
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某广告说用某药治疗了100例某病病人，其中95例痊愈，治愈率达95%。此治愈率不可信的主要原因是（）
A.所治病例数过少
B.缺少对照组
C.治愈率太高
D.没有经过统计学检验
E.没有关于偏倚控制的说明
参考答案：B
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