皮皮学，免费搜题
登录
搜题
【单选题】
某广告说'某新药治疗1000名上呼吸道感染者，其中950名在5天内症状消失，从而认为，这种新药治疗上呼吸道感染有奇效'你认为A.
正确，因为有95%的患者症状消失
B.
不正确，因为没有计算治愈率
C.
不正确，因为没有设立对照组
D.
不正确，因为没有作统计学检验
E.
不正确，因为样本含量不够大
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】判断图题所示各电路为 TTL或CMOS结构时的输出是高电平还是低电平,并将结果填入表中。 图(a) 图(b) 图(c) 图(d) 图(e) TTL结构 高电平 高电平 低电平 高阻态 高电平 CMOS结构
【单选题】For most students, the largest single cost of a college education is
A.
the wages given up to attend school
B.
tuition, fees, and books.
C.
room and board.
D.
transportation, parking, and entertainment.
【单选题】Most students in grades K-12 attend school for 6 to 7 hours a day, 180 days per year. Some schools offer extended learning by adding extra time to the school day or increasing the length of the school...
A.
demand larger school budgets
B.
make more money out of the students
C.
help take care of young students
D.
improve students academically
【单选题】For most students, the largest single cost of a college education is
A.
the wages given up to attend school.
B.
tuition, fees, and books.
C.
room and board.
D.
transportation and entertainment.
【单选题】For most students, the earnings they give up to attend college are
A.
a minor cost when compared to the costs of tuition, room and board, and the like.
B.
the single largest cost of their education.
C.
about equal to the costs of room and board at college.
D.
not considered true costs by an economist.
相关题目：