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【简答题】
某市往年的12岁男孩平均身高为140.0 cm。现在从该市的12岁男孩中随机抽得120名作为研究对象, 得到平均身高为143.1 cm, 标准差为6.3 cm。请估计该样本对应总体均数的95%置信区间,并确定该均数是否与往年不同。 某学生的回答如下:“该例12岁男孩平均身高的点估计值为143.1 cm,按公式(4-21)计算得到该点估计值的95%置信区间为141.9~144.2 cm。因为往年12岁男孩平均身高为140.0 cm,没有落在所计算的95%置信区间以内,所以可以认为现有男孩平均身高与往年身高有差异”。 请指出学生回答中的不恰当之处。
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【单选题】His full name is Chris Topher Supa. His family name is ______. [      ]
A.
Supa
B.
Chris
C.
Topher
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【单选题】In the movie of "the pursuit of happiness(当幸福来敲门)", Chris(男主人公)'s wife leaves Chris becuase______
A.
Chris likes playing computer game
B.
Chris can not earn a lot of money
C.
Chris does not love her
D.
Chris has bad temper.
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【简答题】Chris Roddy
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【判断题】灭火常用的方法有窒息法、隔离法、和冷却法。
A.
正确
B.
错误
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【单选题】电渣压力焊的焊接过程包括四个阶段:( )、电弧过程、电渣过程和顶压过程。
A.
引弧过程
B.
熔化过程
C.
接触过程
D.
分离过程
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【多选题】电渣压力焊的焊接过程包括四个阶段（）。
A.
引弧过程
B.
电弧过程
C.
电渣过程
D.
顶压过程
E.
熔融过程
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【单选题】Chris has a one-hour break between classes every Wednesday. Chris can either stay at the library and study or go to the gym and work out. The decision Chris must make is:
A.
not an economic problem because neither one costs money.
B.
not an economic problem because it's an hour that is wasted no matter what Chris does.
C.
an economic problem because the tuition Chris pays covers both the gym and the library.
D.
an economic problem because Chris has only one hour during which he can study or work out.
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【简答题】A．She has more self-confidence than Chris. B．She works with Chris in the same division. C．She has more management experience than Chris. D．She is competing with Chris for the new job. Passage Three
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【简答题】无线传感器网络具有怎么样的协议栈结构?各层实现什么样的功能?
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【判断题】电渣压力焊的焊接过程包括四个阶段：引弧过程、电弧过程、电渣过程和顶压过程。
A.
正确
B.
错误
查看完整题目与答案
相关题目：
【单选题】His full name is Chris Topher Supa. His family name is ______. [      ]
A.
Supa
B.
Chris
C.
Topher
查看完整题目与答案
【单选题】In the movie of "the pursuit of happiness(当幸福来敲门)", Chris(男主人公)'s wife leaves Chris becuase______
A.
Chris likes playing computer game
B.
Chris can not earn a lot of money
C.
Chris does not love her
D.
Chris has bad temper.
查看完整题目与答案
【简答题】Chris Roddy
查看完整题目与答案
【判断题】灭火常用的方法有窒息法、隔离法、和冷却法。
A.
正确
B.
错误
查看完整题目与答案
【单选题】电渣压力焊的焊接过程包括四个阶段:( )、电弧过程、电渣过程和顶压过程。
A.
引弧过程
B.
熔化过程
C.
接触过程
D.
分离过程
查看完整题目与答案
【多选题】电渣压力焊的焊接过程包括四个阶段（）。
A.
引弧过程
B.
电弧过程
C.
电渣过程
D.
顶压过程
E.
熔融过程
查看完整题目与答案
【单选题】Chris has a one-hour break between classes every Wednesday. Chris can either stay at the library and study or go to the gym and work out. The decision Chris must make is:
A.
not an economic problem because neither one costs money.
B.
not an economic problem because it's an hour that is wasted no matter what Chris does.
C.
an economic problem because the tuition Chris pays covers both the gym and the library.
D.
an economic problem because Chris has only one hour during which he can study or work out.
查看完整题目与答案
【简答题】A．She has more self-confidence than Chris. B．She works with Chris in the same division. C．She has more management experience than Chris. D．She is competing with Chris for the new job. Passage Three
查看完整题目与答案
【简答题】无线传感器网络具有怎么样的协议栈结构?各层实现什么样的功能?
查看完整题目与答案
【判断题】电渣压力焊的焊接过程包括四个阶段：引弧过程、电弧过程、电渣过程和顶压过程。
A.
正确
B.
错误
查看完整题目与答案
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