A.y和x都是隨機(jī)變量
B.y是隨機(jī)變量，x是確定性變量
C.y是確定性變量，x是隨機(jī)變量
D.y和x都是確定性變量
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A.屬性化
B.數(shù)量化
C.同質(zhì)化
D.差異化
A.等于0
B.等于總平方和
C.完全由觀測的隨機(jī)誤差引起
D.完全由各因子水平的差異引起
A.必然事件
B.不可能事件
C.小概率事件
D.大概率事件
A.原假設(shè)為真的條件下檢驗(yàn)統(tǒng)計(jì)量的概率分布
B.備擇假設(shè)為真的條件下檢驗(yàn)統(tǒng)計(jì)量的概率分布
C.觀測變量的總體概率分布
D.觀測變量的樣本分布
A.α
B.β
C.1－α
D.1－β
最新試題
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（）
品合格率指標(biāo)是（）
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). The average number of absences per employee, calculated from the personnel data of all employees, is a （）.
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 （）.
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（）
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（）
Descriptive statistics deals with methods of（）
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？（）