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
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A.α
B.β
C.1-α
D.1-β
A.θ^的數(shù)值接近于總體參數(shù)θ
B.θ^的期望等于總體參數(shù)θ
C.θ^的方差接近于總體參數(shù)θ
D.θ^的方差接近于總體方差σ2
A.近似等于θ的量
B.隨機(jī)變量
C.數(shù)學(xué)期望等于θ的統(tǒng)計(jì)量
D.方差固定的統(tǒng)計(jì)量
A.正態(tài)分布
B.x2分布
C.t分布
D.均勻分布
A.一致性
B.無偏性
C.有效性
D.充分性
最新試題
Descriptive statistics deals with methods of()
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)?
某企業(yè)的生產(chǎn)計(jì)劃完成百分比采用如下分組,請指出哪項(xiàng)是正確的()
在組距數(shù)列中,下限就是()
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過四個(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?
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 ().
A cumulative frequency polygon is also called ().
要了解某地區(qū)全部大學(xué)生的就業(yè)情況,那么()
One advantage of a stem and leaf plot over a frequency distribution is that ().