A.變量x的標準差
B.變最y的標準差
C.變量x和y兩標準差的乘積
D.變量x和y的協(xié)方差
您可能感興趣的試卷
你可能感興趣的試題
A.算術(shù)平均數(shù)
B.中位數(shù)
C.眾數(shù)
D.調(diào)和平均數(shù)
A.2個
B.3個
C.4個
D.5個
A.任意調(diào)查
B.立意調(diào)查
C.配額抽樣
D.整群抽樣
A.名義尺度
B.順序尺度
C.差距尺度
D.比例尺度
A.每個省的人口
B.每個縣的人口
C.每個家庭的人口
D.每個人
![](https://static.ppkao.com/ppmg/img/appqrcode.png)
最新試題
The number of class intervals in a frequency distribution is usually between ().
A summary measure that is computed from a sample to describe a characteristic of the population is called()
Descriptive statistics deals with methods of()
Which of the following is not the goal of descriptive statistics?()
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()
變量數(shù)列中,各組頻率之和應()
要了解某地區(qū)全部大學生的就業(yè)情況,那么()
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?
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 cumulative frequency distribution would provide().