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(duì)病情相似的20-44歲的患者進(jìn)行隨機(jī)抽樣，測(cè)試所服藥品在消化道中的中轉(zhuǎn)時(shí)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(shí)間。
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A cumulative frequency polygon is also called （）.
對(duì)某班級(jí)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（）
最能反映離散程度的指標(biāo)是（）
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 （）.
某班的學(xué)習(xí)按考試成績(jī)分為60分以下，60-70，70-80，80-90，90-100，這種分組（）
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 （）.
If the individual class frequency is divided by the total frequency, the result is the （）.
Which of the following statements is not true？（）
One advantage of a stem and leaf plot over a frequency distribution is that （）.
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）