多項(xiàng)選擇題在商務(wù)和經(jīng)濟(jì)統(tǒng)計(jì)分析中,計(jì)算平均發(fā)展速度的方法通常有()

A.環(huán)比法
B.定基法
C.方程法
D.算術(shù)平均法
E.幾何平均法


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1.多項(xiàng)選擇題可用來(lái)反映產(chǎn)業(yè)成長(zhǎng)過(guò)程的S形生長(zhǎng)曲線模型有()

A.指數(shù)曲線趨勢(shì)模型
B.修正指數(shù)曲線趨勢(shì)模型
C.邏輯曲線趨勢(shì)模型
D.龔配茨曲線趨勢(shì)模型
E.雙指數(shù)曲線趨勢(shì)模型

2.多項(xiàng)選擇題線性回歸模型的判定系數(shù)R2可表示為()

A.R2=SSR/SST
B.R2=SSE/SST
C.R2=1-SSR/SST
D.R2=1-SSE/SST
E.R2=1-SSR/(SSR+SSE)

3.多項(xiàng)選擇題

在y對(duì)x是線性回歸模型中,隨機(jī)誤差u產(chǎn)生的原因有()

A.各種細(xì)小的偶然因素
B.對(duì)y的觀測(cè)誤差
C.對(duì)x的觀測(cè)誤差
D.x的高次項(xiàng)對(duì)y的影響
E.模型參數(shù)估計(jì)的錯(cuò)誤

4.多項(xiàng)選擇題根據(jù)線性回歸分析的基本假定,因變量的觀測(cè)值必須()

A.數(shù)學(xué)期望為0
B.具有相同的方差
C.服從正態(tài)分布
D.不同次觀測(cè)相互獨(dú)立
E.與自變量的取值相互獨(dú)立

最新試題

A summary measure that is computed from a sample to describe a characteristic of the population is called()

題型:?jiǎn)雾?xiàng)選擇題

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?

題型:?jiǎn)柎痤}

品合格率指標(biāo)是()

題型:?jiǎn)雾?xiàng)選擇題

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()

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If the individual class frequency is divided by the total frequency, the result is the ().

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在組距數(shù)列中,下限就是()

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If data are grouped into intervals and the number of items in each group is listed, this could be called a ()

題型:?jiǎn)雾?xiàng)選擇題

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?()

題型:?jiǎn)雾?xiàng)選擇題

Which of the following is best to show the percentage of a total budget that is spent on each category of items?()

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A student achieves an 82 on the first test in a statistics course. From this, she assumes that her average at the end of the semester (after other tests) will be about 82. This is an example of ().

題型:?jiǎn)雾?xiàng)選擇題