A.變量x的標準差
B.變量y的標準差
C.變量x和y兩個標準差的乘積
D.變量x和y的協(xié)方差
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A.平均差大于標準差
B.平均差小于標準差
C.平均差等于標準差
D.二者關系不定
A.左偏分布
B.右偏分布
C.對稱分布
D.均勻分布
A.0
B.1
C.-1
D.0.5
A.眾數(shù)
B.中位數(shù)
C.極值
D.均值
A.簡單算術平均數(shù)
B.加權算術平均數(shù)
C.簡單調(diào)和平均數(shù)
D.加權調(diào)和平均數(shù)
最新試題
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 （）.
One advantage of a stem and leaf plot over a frequency distribution is that （）.
變量數(shù)列中，各組頻率之和應（）
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). The average number of absences per employee, calculated from the personnel data of all employees, is a （）.
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
在組距數(shù)列中，下限就是（）
某班的學習按考試成績分為60分以下，60-70，70-80，80-90，90-100，這種分組（）
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過四個車間，這四個車間的廢品率分別為1.5%、2.0%、2.0%和1.0%。該企業(yè)生產(chǎn)這種產(chǎn)品的平均廢品率是多少？
某廠某年職工勞動生產(chǎn)率為20000元，是歷史最高水平的1.2倍。這里的1.2倍是（）
A cumulative frequency distribution would provide（）.