使用最小二乘法估計(jì)得出的樣本回歸直線必然通過點(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.觀測變量的總體概率分布
D.觀測變量的樣本分布
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()
One rule that must always be followed in constructing frequency distributions is that ().
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 cumulative frequency of the third class?()
A summary measure that is computed from a sample to describe a characteristic of the population is called()
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?()
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?
對(duì)全國各鐵路交通樞紐的貨運(yùn)量、貨物種類等進(jìn)行調(diào)查,以了解全國鐵路貨運(yùn)概況。這種調(diào)查屬于()
A cumulative frequency polygon is also called ().
某班的學(xué)習(xí)按考試成績分為60分以下,60-70,70-80,80-90,90-100,這種分組()