A.直線趨勢(shì)
B.曲線趨勢(shì)
C.異方差
D.異常數(shù)據(jù)
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使用最小二乘法估計(jì)得出的樣本回歸直線
必然通過(guò)點(diǎn)（）
A.（0，0）
B.（x，0）
C.（0，y）
D.（x，y）
A.y和x都是隨機(jī)變量
B.y是隨機(jī)變量，x是確定性變量
C.y是確定性變量，x是隨機(jī)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(cè)的隨機(jī)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
對(duì)某班級(jí)學(xué)生的生活狀況進(jìn)行統(tǒng)計(jì)調(diào)查，下列標(biāo)志中屬于不變標(biāo)志的是（）
在組距數(shù)列中，下限就是（）
如果居民按報(bào)告期價(jià)格購(gòu)買商品需多支出40萬(wàn)元，報(bào)告期商品銷售額為200萬(wàn)元，則價(jià)格指數(shù)為（）
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？（）
為什么在計(jì)算平均指標(biāo)的基礎(chǔ)上還有必要進(jìn)一步計(jì)算變異指標(biāo)？
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？（）
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）
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 （）.
變量數(shù)列中，各組頻率之和應(yīng)（）