A.一致性
B.無偏性
C.有效性
D.充分性
您可能感興趣的試卷
你可能感興趣的試題
A.變量x的標(biāo)準(zhǔn)差
B.變量y的標(biāo)準(zhǔn)差
C.變量x和y兩個(gè)標(biāo)準(zhǔn)差的乘積
D.變量x和y的協(xié)方差
A.平均差大于標(biāo)準(zhǔn)差
B.平均差小于標(biāo)準(zhǔn)差
C.平均差等于標(biāo)準(zhǔn)差
D.二者關(guān)系不定
A.左偏分布
B.右偏分布
C.對(duì)稱分布
D.均勻分布
A.0
B.1
C.-1
D.0.5
A.眾數(shù)
B.中位數(shù)
C.極值
D.均值
最新試題
什么是季節(jié)變動(dòng)？研究它的意義何在？如何測定季節(jié)變動(dòng)？
A summary measure that is computed from a sample to describe a characteristic of the population is called（）
One rule that must always be followed in constructing frequency distributions is that （）.
某班的學(xué)習(xí)按考試成績分為60分以下，60-70，70-80，80-90，90-100，這種分組（）
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)？
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
The number of class intervals in a frequency distribution is usually between （）.
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 （）.
在組距數(shù)列中，下限就是（）
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 cumulative frequency of the third class？（）