同等劑量的藥品采用不同的服用方式往往取得不同的效果,方案A是在每日三餐后服用,方案B是每日僅僅服用一次相同總劑量的藥品。對病情相似的20-44歲的患者進行隨機抽樣,測試所服藥品在消化道中的中轉(zhuǎn)時間,選擇服用方案的順序是隨機的。下表給出了12名患者分別按方案A和方案B服用后,藥品在消化道中的中轉(zhuǎn)時間。
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Which of the following is not the goal of descriptive statistics?()
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?()
某廠某年職工勞動生產(chǎn)率為20000元,是歷史最高水平的1.2倍。這里的1.2倍是()
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?
One advantage of a stem and leaf plot over a frequency distribution is that ().
某班的學習按考試成績分為60分以下,60-70,70-80,80-90,90-100,這種分組()
If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
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變量數(shù)列中,各組頻率之和應()