A.概念
B.數(shù)值
C.概念和數(shù)值
D.數(shù)值尺度
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A.單值
B.等距分組
C.異距分組
D.復(fù)合分組
A.各個個體的名稱與指標(biāo)數(shù)值
B.各組變量值與次數(shù)
C.各組變量值與其方差
D.各組均值與方差
A.簡單隨機(jī)抽樣
B.系統(tǒng)抽樣
C.分層抽樣
D.整群抽樣
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
最新試題
在組距數(shù)列中，下限就是（）
Which of the following statements is not true？（）
什么是季節(jié)變動？研究它的意義何在？如何測定季節(jié)變動？
Which of the following is not the goal of descriptive statistics?（）
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 （）.
A cumulative frequency polygon is also called （）.
One rule that must always be followed in constructing frequency distributions is that （）.
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？（）
Simon Arnett, Director of Human Resources, is exploring the causes of employee absenteeism at Buderim Bottling during the last operating year (1 January 2005 to 31 December 2005). Personnel records of 50 employees are selected for analysis. (The plant employs 250.) For this study, the average number days absent for these 50 employees is a （）.
以2000年a0為最初水平，2016年an為最末水平，計算鋼產(chǎn)量的年平均發(fā)展速度時，須開（）