某生產(chǎn)線是按照兩種操作平均裝配時(shí)間之差為5分鐘而設(shè)計(jì)的，兩種裝配操作的獨(dú)立樣本產(chǎn)生如下資料：
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假設(shè)檢驗(yàn)中
拒絕域?yàn)椋ǎ?/p>
A.Z<-1.96
B.Z>1.96
C.Z>1.65
D.Z<-1.65
一家電器銷售公司的管理人員認(rèn)為，每月的銷售額是廣告費(fèi)用的函數(shù)，并想通過廣告費(fèi)用對(duì)月銷售額作出估計(jì)。用電視廣告費(fèi)用作自變量，銷售額作因變量進(jìn)行回歸分析。下表給出了相關(guān)的分析結(jié)果，
下列說法正確的是（）
A.廣告費(fèi)用每增加$1，000， 銷售額增加$1.420 211
B.廣告費(fèi)用每增加$1，000， 銷售額增加$1420. 211
C.廣告費(fèi)用每增加$1420.211， 銷售額增加$1000
D.廣告費(fèi)用每增加$1， 銷售額增加$363.689 1
A.組間平方和除以組內(nèi)平方和
B.組內(nèi)均方和除以組間均方
C.組間平方和除以總平方和
D.組間均方和除以組內(nèi)均方
最新試題
品合格率指標(biāo)是（）
A cumulative frequency distribution would provide（）.
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（）
在組距數(shù)列中，下限就是（）
某企業(yè)2018年技術(shù)工占50%，2019年新招收了一批學(xué)徒工，使學(xué)徒工的比重增加了10%。假定全廠各級(jí)工資水平均無變化，則2019年職工總平均工資將（）
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 （）.
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 （）.
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 （）.
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？（）
最能反映離散程度的指標(biāo)是（）