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
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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
A.變量x的標(biāo)準(zhǔn)差
B.變量y的標(biāo)準(zhǔn)差
C.變量x和y兩個(gè)標(biāo)準(zhǔn)差的乘積
D.變量x和y的協(xié)方差
A.平均差大于標(biāo)準(zhǔn)差
B.平均差小于標(biāo)準(zhǔn)差
C.平均差等于標(biāo)準(zhǔn)差
D.二者關(guān)系不定
最新試題
對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（）
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？
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 （）.
最能反映離散程度的指標(biāo)是（）
如果居民按報(bào)告期價(jià)格購買商品需多支出40萬元，報(bào)告期商品銷售額為200萬元，則價(jià)格指數(shù)為（）
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？（）
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（）
Which of the following statements is not true？（）
Which of the following is not the goal of descriptive statistics?（）