【单选题】【消耗次数：1】
离中趋势指标中，最容易受极端值影响的是（）。
①
极差
②
方差
③
标准差
④
标准差系数
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相关题目
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什么是标准差系数？标准差系数在什么条件下使用？
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下列有关标准差的说法中错误的是（）。
①
样本标准差用S表示
②
标准差越大，数据的集中趋势越小
③
方差的算术平方根称为标准差
④
标准差的量纲与原变量一致
⑤
标准差越大，数据的离散趋势越大
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平均差与方差或标准差相比其主要缺点是（）
①
没有充分利用全部数据的信息
②
易受极端值的影响
③
数学处理上采用绝对值,不便于计算
④
在数学性质上不是最优的
⑤
计算结果不够准确
随机题目
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Your proposal （） by the committee soon.
①
is discussed
②
has been discussed
③
is going to be discussed
④
will have been discussed
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There are some areas which are still densely populated ____ their severe weather conditions.
①
due to
②
with regard to
③
regardless of
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but for
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We all thought ______ pity that you were unable to attend our meeting.
①
that
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which
③
this
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The shy girl felt ____ and uncomfortable when she could not answer her teacher’s questions.
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amazed
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awkward
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curious
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amused
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Free ______ of shampoo is distributed from door to door.
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sample
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example
③
product
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stock
【单选题】
A police officer claimed he had attempted to _______ paying his fare.
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avoid
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reject
③
refuse
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neglect
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He is late again today. I’ll ____ that he will not be late tomorrow.
①
refer to it
②
look to him
③
see to it
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turn to it
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Must I take a taxi?No, you _______. You can take my car.
①
had better to
②
don’t
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must not
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So clear was his _____ of the case that others had no more to say.
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attitude
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presentation
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comment
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remark
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When Lily came home at 5 p.m. yesterday, her mother ______ dinner in the kitchen.
①
cooked
②
was cooking
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cooks
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has cooked