【简答题】标准差系数抽象了( )A. 总体单位数多少的影响 B. 标志变异程度的影响 C. 总体指标数值大小的影响 D. 平均水平高低的影响
【单选题】听力原文:You don't usually get this much snow, do you? (A) You don't? I thought you did. (B) Me too, I love being out in it. (C) No, this is definitely unusual. (30)
【单选题】You'll be late for the meeting, . [ ]
A.
though you don't hurry
【单选题】在抽样调查中,因为由样本作出的估计值随着抽选样本的不同而变化,即使观察完全正确,它和总体指标之间往往也存在差异,这种差异纯粹是由抽样引起的,称之为( )