【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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【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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随机题目
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have
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will have
③
has
④
shall has
【单选题】
19. _______hand in his exercise book before Monday.
①
Need he to
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Does he need
③
Needs he to
④
Need he
【单选题】
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①
has; was asked
②
have; were asked
③
had; is asked
④
had; was asked
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①
might lose
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would have lost
③
should have lost
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must have lost
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must be
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must have been
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should be
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should have been
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①
may
②
might
③
could
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must
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①
but
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and
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though
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so
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supporting
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having supported
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being supported by
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being supported
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5.____the front door____, he had to enter the room through the back door.
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Seen, painted
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Seeing, painted
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Being seen, being painted
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Seeing, being painted