For the least. American roots are no longer an easy selling point. Through much of the postwar period, US brands could play off this cachet; Levi’s ad campaigns used wholesome themes of boy-meets-girl in a heartland American setting until the early 1990s.

A．At least

B．At the least

C．At most

D．At the most

抽样具有科学性的理由是（）。

A.从总体中抽取样本单位时遵从随机原则

B.部分来自于全体，必带有反映全体的信息

C.样本数据对总体参数的充分代表性

D.构成（同质）总体的一些个体之间在性质上必定相似或相近

E.不管原始分布如何，样本平均数的分布总可视为正态分布，而且由此得到总体参数准确估计的概率值极大