题目内容

Football is a very popular game. It(play) all over the world.

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Stamps(buy) at any post office.

Scientists and clothing designers are working on fashion's next big thing: "." Clothes must or no one will buy and wear them. Scientists need to work with so the clothes are both and .

频数分布的两个重要特征是

A. 统计量与参数
B. 样本均数与总体均数
C. 集中趋势与离散趋势（变异程度）
D. 样本标准差与总体标准差
E. 样本与总体

各观察值均加(或减)同一数后，

A. 均数改变，标准差不变
B. 均数不变，标准差改变
C. 两者均不变
D. 两者均改变
E. 根据实际数据而定