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【单选题】
以下不是用来描述样本分散程度的统计量的是（）。A.
样本极差
B.
样本方差
C.
样本均值
D.
样本标准差
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反馈参考答案：
举一反三
【判断题】During the 20th century, the automobile rapidly developed from an expensive toy for the rich into a practical vehicle for transport in most developed countries. In developing countries, the practical ...
A.
正确
B.
错误
【单选题】一般而言,采用产品差异化战略的企业,具有以下特征( )。
A.
销售毛利率高，总资产周转率高
B.
销售毛利率高，总资产周转率低
C.
销售毛利率低，总资产周转率高
D.
销售毛利率低，总资产周转率低
【简答题】化简 sin(nπ+α)cos(nπ-α) cos[(n+1)π-α] ，n∈Z．
【简答题】The European Union picked up the theme, and referred to it as Road Transport Informatics. In the course of time the name of this technology was subjected to many changes 6) __________ the USA gave it...
【简答题】Concorde SST The most impressive aircraft f the jet age was the supersonic transport aircraft, Concorde. This aircraft flew faster than the speed of sound and allowed three hour flights between New Yo...
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