【简答题】【消耗次数：1】
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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【简答题】
什么是变异系数？变异系数的应用条件是什么？请写出标准差异系数的计算公式
【单选题】
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
【单选题】
均数和标准差的关系是:（）。
①
均数愈大,S愈小
②
均数愈大,S愈大
③
S愈大,均数对各变量值的代表性愈好
④
S愈小,均数对各变量值的代表性愈好
⑤
S愈小,均数与总体均数的距离愈大
随机题目
【单选题】
The bridge which ________last year looks really beautiful.
①
was built
②
built
③
was set up
④
had been built
【单选题】
________work and creative activities have been important drivers of human progress is deeply rooted in our social values.
①
How
②
Whether
③
That
④
Why
【单选题】
Your notes provide the raw material on _______ your mind has to work in relation to your essay topic.
①
where
②
when
③
what
④
which
【单选题】
That day he_______his clothes before he came to see me.
①
has washed
②
washed
③
had been washing
④
was washed
【单选题】
Have you considered________your job as a teacher?Yes.I like the job because a teacher is often considered________a gardener.
①
to change;to be
②
to change;being
③
changing;being
④
changing;to be
【单选题】
Every time I______ there, I will buy him something nice.
①
went
②
will go
③
go
④
have gone
【单选题】
Yourroomis_______ thanmine.
①
three time big
②
threetimesbig
③
threetimesbigger
④
biggerthreetimes
【单选题】
The Tang Dynasty is generally regarded as a golden chapter by people worldwide,________ the Chinese civilization influenced many neighboring countries.
①
where
②
when
③
which
④
who