【多选题】【消耗次数：1】
抽样调查的特点有（）
①
抽选调查单位时必须遵守随机原则
②
抽选出的单位有典型意义
③
抽选出的单位是重点单位
④
使用部分单位的指标数值去推断和估计总体的指标数值
⑤
通常会产生偶然的代表性误差，但这类误差事先可以控制和计算
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相关题目
【单选题】
重点调查中重点单位是指?
①
标志总量在总体中占有很大比重的单位
②
具有典型意义或代表性的单位
③
那些具有反映事物属性差异的品质标志的单位
④
能用以推算总体标志总量的单位
【单选题】
重点调查中重点单位是指
①
标志总量在总体中占有很大比重的单位
②
具有重要意义或代表性的单位
③
那些具有反映事物属性差异的品质标志的单位
④
能用以推算总体标志总量的单位
【判断题】
判断对错：抽样调查是从总体中按随机原则抽取部分单位作为样本，进行观察研究，并根据这部分单位的调查结果来推断总体，以达到认识总体的一种统计调查方法。( )
①
正确
②
错误
随机题目
【单选题】
As for words which do not often occur in everyday situation, you just need to be able to ____.
①
recognize them
②
nod at them
③
concentrate much on them
④
practice using them constantly
【单选题】
According to the text, which of the following is NOT one of the possible activities for you to practice speaking English at school?
①
To talk to native speakers on campus.
②
To speak English to the waitress in English as you pay for a meal in a restaurant.
③
To rehearse aloud by yourself.
④
To talk with your classmates in English.
【单选题】
The place did not seem to be popular, for it was completely deserted, and in any case _____ to traffic.
①
inaccessible
②
inadequate
③
insignificant
④
incompatible
【单选题】
The head of the museum was _____and let us actually examine the ancient manuscripts.
①
promising
②
agreeing
③
pleasing
④
obliging
【单选题】
Lucy，who did not even go to grade school, had no ________of a job at the time.
①
interview
②
pressure
③
prospect
④
application
【单选题】
The lecture provided ____ insight into foreign affairs.
①
penetrating
②
pendular
③
passive
④
penal
【单选题】
Linda is 35 years o1d and, after two close relationships, the prospect of staying single__________ her.
①
impresses
②
depresses
③
threatens
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stuns
【单选题】
The manager said that there were two reasons______ our sales dropped sharply last year.
①
because
②
since
③
why
④
while
【单选题】
Henry’ s actually ______ of telling lies, pretending to be sick when he s heathy.
①
capable
②
spontaneous
③
competent
④
expert