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(jìn)行隨機(jī)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(jī)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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If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
對全國各鐵路交通樞紐的貨運(yùn)量、貨物種類等進(jìn)行調(diào)查,以了解全國鐵路貨運(yùn)概況。這種調(diào)查屬于()
Which of the following is not the goal of descriptive statistics?()
最能反映離散程度的指標(biāo)是()
常用的長期趨勢測定的方法有哪些?各有什么特點(diǎn)?
什么是季節(jié)變動?研究它的意義何在?如何測定季節(jié)變動?
A summary measure that is computed from a sample to describe a characteristic of the population is called()
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 ().
一個地區(qū)一定時期的商品零售額屬于()
品合格率指標(biāo)是()