A.必須相同
B.必須不同
C.可以相同，也可以不同
D.完全沒有關(guān)系
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A.年齡
B.學(xué)習(xí)成績
C.專業(yè)
D.個人愛好
A.全部大學(xué)畢業(yè)生是研究總體
B.大學(xué)畢業(yè)生總數(shù)是統(tǒng)計指標(biāo)
C.大學(xué)畢業(yè)生就業(yè)率是統(tǒng)計標(biāo)志
D.反映每位大學(xué)畢業(yè)生特征的職業(yè)是數(shù)量指標(biāo)
A.全距
B.標(biāo)準(zhǔn)差
C.平均差
D.標(biāo)準(zhǔn)差系數(shù)
A.Summarising data
B.Displaying aspects of the collected data
C.Reporting numerical findings
D.Estimating characteristics of the population
A.1.2
B.0.8
C.1.25
D.0.83
A.3 and 5
B.7 and 9
C.5 and 15
D.1 and 25
The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.
What is the approximate range of the number of phone calls arriving each hour？（）
A.80
B.200
C.20
D.100
A.descriptive statistics
B.inferential statistics
C.nonparametric statistics
D.wishful thinking
最新試題
A summary measure that is computed from a sample to describe a characteristic of the population is called（）
The number of class intervals in a frequency distribution is usually between （）.
某企業(yè)2018年技術(shù)工占50%，2019年新招收了一批學(xué)徒工，使學(xué)徒工的比重增加了10%。假定全廠各級工資水平均無變化，則2019年職工總平均工資將（）
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
某企業(yè)的生產(chǎn)計劃完成百分比采用如下分組，請指出哪項是正確的（）
A student achieves an 82 on the first test in a statistics course. From this, she assumes that her average at the end of the semester (after other tests) will be about 82. This is an example of （）.
在組距數(shù)列中，下限就是（）
The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the cumulative frequency of the third class？（）
某班的學(xué)習(xí)按考試成績分為60分以下，60-70，70-80，80-90，90-100，這種分組（）
One rule that must always be followed in constructing frequency distributions is that （）.