A.直線趨勢
B.曲線趨勢
C.異方差
D.異常數(shù)據(jù)
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使用最小二乘法估計得出的樣本回歸直線必然通過點()
A.(0,0)
B.(x,0)
C.(0,y)
D.(x,y)
A.y和x都是隨機變量
B.y是隨機變量,x是確定性變量
C.y是確定性變量,x是隨機變量
D.y和x都是確定性變量
A.屬性化
B.數(shù)量化
C.同質(zhì)化
D.差異化
A.等于0
B.等于總平方和
C.完全由觀測的隨機誤差引起
D.完全由各因子水平的差異引起
A.必然事件
B.不可能事件
C.小概率事件
D.大概率事件
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 ().
最能反映離散程度的指標(biāo)是()
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?
一個地區(qū)一定時期的商品零售額屬于()
要了解某地區(qū)全部大學(xué)生的就業(yè)情況,那么()
A cumulative frequency distribution would provide().
Which of the following statements is not true?()
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()
為什么在計算平均指標(biāo)的基礎(chǔ)上還有必要進一步計算變異指標(biāo)?