A.變窄
B.變寬
C.不變
D.不能確定
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A.要寬
B.要窄
C.相同
D.可能寬也可能窄
A.正態(tài)分布
B.只有當(dāng)n＜30時(shí)，為正態(tài)分布
C.只有當(dāng)n≥30時(shí)，為正態(tài)分布
D.非正態(tài)分布
A.足夠大時(shí)
B.足夠小時(shí)
C.無(wú)論大與小
D.無(wú)法判斷
A.隨機(jī)誤差
B.抽樣框誤差
C.回答誤差
D.無(wú)回答誤差
五位部門(mén)經(jīng)理的年收入如表：要描述五位部門(mén)經(jīng)理的年收入的一般水平，（）來(lái)測(cè)度這一集中趨勢(shì)比較合適。
A.眾數(shù)
B.中位數(shù)
C.平均數(shù)
D.極差
最新試題
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（）
最能反映離散程度的指標(biāo)是（）
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（）
Which of the following statements is not true？（）
A cumulative frequency distribution would provide（）.
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？
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 （）.
If the individual class frequency is divided by the total frequency, the result is the （）.
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？（）