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【简答题】
我的研究目标是去获取全班全部100名同学的平均身高数据(请不要在意性别,粗暴地假设世界上只有一种性别就好,请不要吐槽我研究身高居然不将男女分开研究),由于时间紧迫,不允许我搜集全班所有同学的身高数据,迫使我们采用随机抽样的方式调查30名同学,然后用这一部分同学的平均身高去估计全班同学的平均身高。在这个研究中,总体是什么?样本是什么?变量是什么?从计量尺度的角度来看,这里的变量是不是数值型变量?
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】不管成交与否，当顾客稍有疑问时，推销员便以对方当然会购买的说法迫使顾客交易。这种交易成交方法叫（）。
A.
假定成交法
B.
保证成交法
C.
选择成交法
D.
最后成交法
【多选题】根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。(71 )When a person does a certain thing again, he is impelled(迫使) by some unseen force to do the same thing repeatedly; thus a habit is formed．Once a habit is ...
A.
There are other habits which, when formed in early life, are of great help.
B.
Whether good or not habits are, they are easy to get rid of.
C.
We ought to keep from all these bad habits, and try to form such habits as will prove good for ourselves and others.
D.
Habits, whether good or bad, are gradually formed.
E.
It is very important for us to know why we should get used to good habits.
F.
These are all easily formed habits.
G.
It is therefore very important that we should pay great attention to the formation of habits.