A.平均差大于標(biāo)準(zhǔn)差
B.平均差小于標(biāo)準(zhǔn)差
C.平均差等于標(biāo)準(zhǔn)差
D.二者關(guān)系不定
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A.左偏分布
B.右偏分布
C.對(duì)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(jiǎn)單算術(shù)平均數(shù)
B.加權(quán)算術(shù)平均數(shù)
C.簡(jiǎn)單調(diào)和平均數(shù)
D.加權(quán)調(diào)和平均數(shù)
A.兩點(diǎn)分布
B.二項(xiàng)分布
C.超幾何分布
D.泊松分布
最新試題
變量數(shù)列中，各組頻率之和應(yīng)（）
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？（）
某廠某年職工勞動(dòng)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（）
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(jí)工資水平均無變化，則2019年職工總平均工資將（）
Which of the following is not the goal of descriptive statistics?（）
常用的長(zhǎng)期趨勢(shì)測(cè)定的方法有哪些？各有什么特點(diǎn)？
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 （）.
A cumulative frequency distribution would provide（）.
One advantage of a stem and leaf plot over a frequency distribution is that （）.
某班的學(xué)習(xí)按考試成績(jī)分為60分以下，60-70，70-80，80-90，90-100，這種分組（）