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【单选题】
标准差与标准误的主要区别在于A.
两者是性质完全不同的两类指标
B.
标准差能反映一组数值的离散程度，而标准误不能
C.
标准误是样本均数的标准差
D.
标准误数值受标准差影响，当样本含量一定时，两者成正比例关系
E.
标准差大，表示变量值越分散，而标准误大，则均数分布的抽样误差大
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【简答题】Domestic airline passengers will be able to make phone calls and send e-mails from the sky from next year, a local carrier has said. Shenzhen Airlines said on Monday it has signed an agreement with Ge...
【简答题】These tickets allow passengers to fly directly from Heathrow to Nice.
【单选题】We learn from the passage that__________
A.
the passengers will have a night flight
B.
they will have, meals during the flight
C.
the plane is going to fly across a sea
D.
the plane provides excellent service to its，passengers
【单选题】－How many passengers were in the plane? －It ______ 227, 153 people from the Chinese mainland and one from Taiwan ______.
A.
contained; included
B.
contained; including
C.
included; contained
D.
contained; containing
【多选题】关于急性肾小球肾炎,哪些是正确的
A.
多有抗“O”升高
B.
2 岁以下，儿童常见
C.
A 组β溶血性链球菌感染后
D.
多见于呼吸道或皮肤的感染后
E.
多见于儿童和青少年
【多选题】关于急性肾小球肾炎,哪些是正确的
A.
多有抗“O”升高
B.
2岁以下，儿童常见
C.
A组β溶血性链球菌感染后
D.
多见于呼吸道或皮肤的感染后
E.
发病率占小儿泌尿系统疾病首位
【简答题】Railways and airlines want to win passengers from each other.
【简答题】How many passengers were there on board when the Titanic sailed from Southampton?
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