问题 单项选择题

使用一种治疗高血压的新药,在一个疗程后,记录用药后舒张压变化为随机变量X。今抽测18位病人用药后舒张压的变化数据(单位:毫米汞柱)为-5,-1,+2,+8,-25,+1,-12,-16,+5,-9,-8,-18,-5,-22,+4,-21,-15,-11在X~N(0,σ2)的假定下(σ2为未知数),试问对于σ=0.05的检验水准,该新药对治疗高血压是否有效

这个问题属于()

A.双侧u检验

B.单侧u检验

C.双侧t检验

D.单侧t检验

E.X2检验

答案

参考答案:D

完形填空
A teacher teaching Maths to seven-year-old Laiq asked him, " If I give you one apple and one apple and one apple, how many apples will you have?"
Within a few seconds Laiq   31  confidently, " Four!"
The confused teacher was expecting a(n)   32   correct answer, three.She was disappointed. "Maybe the child did not listen  33   " she thought. She   34   , "Laiq, listen carefully. If I give you one apple and one apple and one apple, how many apples will you have?"
Laiq had seen the   35  on his teacher' s face. He  36  again on his fingers. But within him he was also   37   the answer that would make the teacher happy. This time hesitatingly he replied, "Four. "
The disappointment stayed on the teacher' s face. Suddenly she   38  that Laiq liked strawberries.She thought maybe he didn’t like apples and that was why he couldn’t answer the question.This time with an excitement in her   39  she asked, " If I give you one strawberry and one strawberry and one strawberry, then how many you will have?"
Seeing the teacher   40  , young Laiq calculated on his fingers again. There was no pressure on him, but a little on the teacher. She wanted her new   41  to succeed.  42  a hesitating smile young Laiq replied, "Three?"
The teacher now had a   43  smile. Her approach had succeeded. She wanted to   44  herself.But one last thing remained.  45  she asked him, "Now if I give you one apple and one apple and one more apple how many will you have?"
Confidently Laiq answered, "Four!" The teacher was   46   "How Laiq, how?" she demanded in a little annoyed voice.
In a voice that was   47  and hesitating young Laiq replied, " Because I already have one   48  in my bag. "
The story tells us:  49  someone gives you an answer that is   50  from what you expect, don' t think they are wrong. There shall be an angle that you may not have thought about yet.
小题1:
A.toldB.addedC.repliedD.wrote
小题2:
A.worthlessB.effortlessC.carelessD.selfless
小题3:
A.possiblyB.activelyC.properlyD.strictly
小题4:
A.repeatedB.orderedC.whisperedD.complained
小题5:
A.satisfactionB.disappointmentC.punishmentD.determination
小题6:
A.recognizedB.discoveredC.calculatedD.insisted
小题7:
A.searching forB.waiting forC.arguing aboutD.talking about
小题8:
A.decidedB.noticedC.expressedD.remembered
小题9:
A.eyesB.handsC.mouthD.nose
小题10:
A.sadB.happyC.pitifulD.lovely
小题11:
A.inventionB.systemC.reformD.approach
小题12:
A.OnB.InC.WithD.By
小题13:
A.victoriousB.preciousC.lastingD.appealing
小题14:
A.thankB.congratulateC.helpD.enjoy
小题15:
A.Above allB.In vainC.On purposeD.Once again
小题16:
A.astonishedB.concernedC.amusedD.relaxed
小题17:
A.highB.lowC.easyD.clear
小题18:
A.strawberryB.appleC.coinD.box
小题19:
A.BeforeB.AfterC.UntilD.When
小题20:
A.absentB.freeC.differentD.safe
单项选择题 A1型题