A.側(cè)檢驗
B.左側(cè)檢驗
C.雙側(cè)檢驗
D.上側(cè)檢驗
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A.精確假設(shè)
B.非精確假設(shè)
C.復(fù)合假設(shè)
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A.28.35小時
B.28.59小時
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A.變量x的標(biāo)準(zhǔn)差
B.變最y的標(biāo)準(zhǔn)差
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D.變量x和y的協(xié)方差
A.算術(shù)平均數(shù)
B.中位數(shù)
C.眾數(shù)
D.調(diào)和平均數(shù)
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B.3個
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D.5個
最新試題
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 （）.
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 （）.
要了解某地區(qū)全部大學(xué)生的就業(yè)情況，那么（）
以2000年a0為最初水平，2016年an為最末水平，計算鋼產(chǎn)量的年平均發(fā)展速度時，須開（）
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（）
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
時間序列構(gòu)成因素有哪些？分解的基本原理和思路是什么？
A cumulative frequency polygon is also called （）.
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（）
A cumulative frequency distribution would provide（）.