A.1次
B.2次
C.3次
D.4次
E.5次
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A.數(shù)學(xué)期望為0
B.相互獨(dú)立
C.方差為常數(shù)
D.方差隨因子水平的增減而增減
E.服從正態(tài)分布
A.加大顯著性水平
B.減小顯著性水平
C.加大樣本容量
D.減小樣本容量
E.使用精確分布
A.原假設(shè)是精確假設(shè)
B.備擇假設(shè)是精確假設(shè)
C.原假設(shè)是非精確假設(shè)
D.備擇假設(shè)是非精確假設(shè)
E.樣本給定
A.總體中各個(gè)個(gè)體之間的差異程度
B.樣本容量的大小
C.總體中個(gè)體數(shù)的多少
D.樣本的抽取方式
E.抽樣調(diào)查中登記誤差的大小
A.一致性
B.無(wú)偏性
C.有效性
D.充分性
E.穩(wěn)健性
最新試題
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 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 （）.
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過(guò)四個(gè)車(chē)間，這四個(gè)車(chē)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？
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)？
Which of the following statements is not true？（）
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)？
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（）
如果居民按報(bào)告期價(jià)格購(gòu)買(mǎi)商品需多支出40萬(wàn)元，報(bào)告期商品銷(xiāo)售額為200萬(wàn)元，則價(jià)格指數(shù)為（）
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
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？（）