若某病传统治疗用药疗效较差,平均好转率为50%,今研制新药希望提高疗效,预计平均好转

题型:单项选择题 A1型题

问题:

若某病传统治疗用药疗效较差,平均好转率为50%,今研制新药希望提高疗效,预计平均好转率为70%,需观察例数为n1,预计平均好转率为80%,需观察例数为n则()

A.n1

B.n1=n2

C.n1>n2

D.需计算检验效能

E.需计算Ⅰ型错误概率

考点:妇幼保健主治医师妇幼保健卫生统计学妇幼保健卫生统计学题库
题型:单项选择题 A1型题

Every object tells a story. Even the most ordinary objects can present to us powerful images. Sometimes it is the ordinary nature of these objects that actually makes them so extraordinary. Such is the case with an old leather shoe in a museum in Alaska. At first glance it does not look like much. It is a woman’s shoe of a style popular in the 1890s. But what is unique about this shoe is where it was found. It was discovered on the Checkout Pass, the famous trail used by the people seeking gold in Alaska. Who it belonged to or why it was left there is not known. Was it perhaps dropped by accident as the woman climbed up the 1500 stairs carved outface Or did she throw away goods that she didn’t need in order to travel lighter
Over 100000 people with "gold fever" made this trip hoping to become millionaires. Few of them understood that on their way they would have to cross a harsh wildness. Unprepared for such a dangerous journey, many died of starvation and exposure to the cold weather.
The Canadian government finally started requiring the gold seekers to bring one ton of supplies with them. This was thought to be enough for a person to survive for one year. They would carry their supplies in backpacks each weighing up to fifty pounds; it usually took at least 40 trips to get everything to the top and over the pass. Whoever dropped the shoe must have been a brave and determined woman. Perhaps she was successful and made it to Alaska. Perhaps she had to turn back in defeat. No one will ever know for sure, but what we do know is that she took part in one of the greatest adventures in the 19th century.

The ordinary woman’s leather shoe is considered unusual because ______.
A. it was an important clue to life in the past
B. it was found on a famous trail
C. it at one time belonged to a VIP
D. it was a fashionable shoe at that time

题型:单项选择题 A1型题

设a是最小的自然数,b是最大的负整数,c是绝对值最小的有理数,则a-b+c=(  )

A.-1

B.0

C.1

D.2

题型:单项选择题 A1型题

工业炉砌筑工序交接的规定要求,工序交接证明书中应有炉体冷却装置、管道和炉壳的试压记录及( )合格盼汪明。

A.安装位置尺寸

B.控制标高测量

C.焊接严密性试验

D.试运转

题型:单项选择题 A1型题

下图示人体某种激素分泌的调节过程,图①至⑤表示五个过程。据图回答:

图中过程①分泌的激素名称是()

题型:单项选择题 A1型题

税收会计核算质量考核,应遵循()。

A、统一规范

B、客观公正

C、逐级考核的原则

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