弗萊兄弟暖氣空調(diào)公司,雇傭了Larry Clark 和George Murnen 兩位員工從事客服工作,公司經(jīng)理Tom Fry對他們每日接到的電話進(jìn)行了統(tǒng)計(jì)。對α=0.05,檢驗(yàn)平均接到的電話數(shù)是否有差異。
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Which of the following is best to show the percentage of a total budget that is spent on each category of items?()
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)?
對某班級學(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()
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過四個車間,這四個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?
在組距數(shù)列中,下限就是()
一個地區(qū)一定時期的商品零售額屬于()
Which of the following is not the goal of descriptive statistics?()
One rule that must always be followed in constructing frequency distributions is that ().
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?()
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()