问题
单项选择题
在抽样调查中,要提高推断的可靠程度即提高概率,必须()
A、缩小误差范围
B、确定总体指标所在的范围
C、扩大误差范围
D、是绝对可靠的范围
答案
参考答案:C
在抽样调查中,要提高推断的可靠程度即提高概率,必须()
A、缩小误差范围
B、确定总体指标所在的范围
C、扩大误差范围
D、是绝对可靠的范围
参考答案:C
补全对话,选择正确的选项填到横线上 Tony: We get an invitation to dinner tomorrow. 小题1:________ Lucy: It’s unnecessary to bring anything. Tony: Really? But we can’t go empty-handed. Lucy: If you really want to bring something, 小题2:____ We can bring some toys for kids. Tony: But I’m not sure whether they will like them. Lucy: 小题3:____ I usually bring flowers when it’s hard to choose a present. Tony: 小题4:______Will you help me to choose some flowers? Lucy: 小题5:_____________
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