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)
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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
A.原假設(shè)為真的條件下檢驗(yàn)統(tǒng)計(jì)量的概率分布
B.備擇假設(shè)為真的條件下檢驗(yàn)統(tǒng)計(jì)量的概率分布
C.觀測(cè)變量的總體概率分布
D.觀測(cè)變量的樣本分布
最新試題
時(shí)間序列構(gòu)成因素有哪些?分解的基本原理和思路是什么?
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()
Which of the following is not the goal of descriptive statistics?()
One rule that must always be followed in constructing frequency distributions is that ().
什么是季節(jié)變動(dòng)?研究它的意義何在?如何測(cè)定季節(jié)變動(dòng)?
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 ().
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過(guò)四個(gè)車間,這四個(gè)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?
以2000年a0為最初水平,2016年an為最末水平,計(jì)算鋼產(chǎn)量的年平均發(fā)展速度時(shí),須開(kāi)()
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()