問答題某公司從甲、乙、丙三個(gè)企業(yè)采購了同一種產(chǎn)品,采購數(shù)量分別占總采購量的25%、30%和45%。這三個(gè)企業(yè)產(chǎn)品的次品率分別為4%、5%、3%。如果從這些產(chǎn)品中隨機(jī)抽出一件,試問:若發(fā)現(xiàn)抽出的產(chǎn)品是次品,問該產(chǎn)品來自丙廠的概率是多少?

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2.單項(xiàng)選擇題

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

最新試題

某企業(yè)的生產(chǎn)計(jì)劃完成百分比采用如下分組,請(qǐng)指出哪項(xiàng)是正確的()

題型:?jiǎn)雾?xiàng)選擇題

If data are grouped into intervals and the number of items in each group is listed, this could be called a ()

題型:?jiǎn)雾?xiàng)選擇題

A summary measure that is computed from a sample to describe a characteristic of the population is called()

題型:?jiǎn)雾?xiàng)選擇題

Which of the following is not the goal of descriptive statistics?()

題型:?jiǎn)雾?xiàng)選擇題

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). The average number of absences per employee, calculated from the personnel data of all employees, is a ().

題型:?jiǎn)雾?xiàng)選擇題

要了解某地區(qū)全部大學(xué)生的就業(yè)情況,那么()

題型:多項(xiàng)選擇題

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?

題型:?jiǎn)柎痤}

One advantage of a stem and leaf plot over a frequency distribution is that ().

題型:?jiǎn)雾?xiàng)選擇題

The number of class intervals in a frequency distribution is usually between ().

題型:?jiǎn)雾?xiàng)選擇題

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)?

題型:?jiǎn)柎痤}