【判断题】【消耗次数：1】
随机取样法在理论上最符合概率论原理。当研究者对所研究总体中各类个体的比例不了解，或总体中的个体之间差异程度较小，或样本数目较大等情况下，它是一种很好的取样方法。但是，它有自己的限制要求和局限性：事先把研究对象编号，比较费时费力；如果总体中的个体分散，抽取到的样本的分布也比较分散，给研究带来困难；当样本容量较小时，可能发生偏差，影响样本的代表性( )。
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正确
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错误
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相关题目
【判断题】
等距随机取样法是先将总体各单位按某一标志顺序编号并排列，再用总体N除以样本容量n，求得抽样间隔，然后在第一个抽样间隔内随机抽取一个作为第一次抽样，并按抽样距离作等距抽样，连续抽样直至满足抽样容量。等距随机取样法比简单随机取样法更简便，它能在总体的整个范围内有系统地抽取样本，因此，一般情况，其样本更为准确、抽样误差比简单随机取样误差小。但是，如果总体中存在周期性的波动或变化，系统取样所得的样本就可能出现系统偏差。( )
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正确
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错误
【单选题】
（ ）是最基本的随机抽样方法，它在抽样之前，对总体单位不进行任何分组、排列等处理，完全按随机原则从总体中抽取样本。
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随机抽样
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重点抽样
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类型随机抽样
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单纯随机抽样
随机题目
【单选题】
He requested [] actually he pleaded that his name be withheld.
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comma
②
dash
③
brackets
④
semicolon
【单选题】
The blizzard continued for a week [] subsequently, they began to run out of food.
①
comma
②
semicolon
【单选题】
I almost spent two hours on this exercise. Find any misplaced modifier in the sentence.
①
two
②
almost
③
on this exercise
【单选题】
Although born and educated in the countryside, Joed like to work [] the big companies are.
①
which
②
when
③
where
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because
【单选题】
Small sailboats can eaily turn over in the water [] they are not managed carefully.
①
though
②
before
③
until
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if
【单选题】
[] so many people want to live in cities is because they want to have fun in there.
①
Why
②
That
③
Whether
④
How
【单选题】
Which sentence is correct?
①
Afer finishing her composition, she took up the translation exercise.
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Afer finishing her composition, the translation exercise was taken up.
【单选题】
Which sentence is correct?
①
Hurrying to the classroom, no one was there.
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Hurrying to the classroom, she saw nobody there.